If you don't have enough bars, you should seriously look into using Power Auras.
Some times, you don't actually need a timed bar for some things, you just need to know if its on or off, or how many stacks. Power Aura is great for that.

For example, procs are things you can't really control. They usually proc as soon as the battle starts and then again after the internal CD is up. I use Power Auras to show me when each proc is up so I know when to use my cooldowns (or ask for one like Hysteria) for multiplicative benefits. When my screen starts lighting up, I know its time to go all out!

I recommend to you NeedToKnow's sister addon, TellMeWhen (http://wow.curse.com/downloads/wow-addons/details/tellmewhen.aspx). TMW shows the relevant icon with its cooldown model, which I find more compact and unobtrusive than a timer bar. It allows for upwards of 8 groups of icon clusters to be displayed, so the ceiling is much higher than the bars limit in NTK.

Both NTK and TMW were both developed by the same developer, TMW should feel at home for you, since the menu system is almost the same as NTK's. It also shows when procs are available, such as revenge or overpower procs.

I'm not sure how Power Auras works, so I apologize if it does what I use NTK for (I'll be giving it a try when I have a chance, though).

I use NTK specifically for procs because I want to know how much time I have for using it. Like Surge of Light (Priest: instant no-cost flash heal), if I don't *have* to use it I'm going to let it sit until the last second or two before burning it on someone that's just a little low on HP, which in turn re-applies Serendipity - another proc I want to know the time for. The same goes for my Arms Warrior; if the Slam proc comes up, but Mortal Strike and the Execute proc are also up, I want to know which ones I can squeeze in without either the Slam or Execute procs fading. Seeing their times let's me juggle abilities appropriately.

The focus issue is a blizzard thing. No addon can set your focus- even if you tell it to.

Power Auras can do all of that (it's a lot more robust in terms of what it can do, including supporting nested checks), but it does have a far steeper learning curve if you want to get the most out of it, as well as a much higher resource usage profile.

@kingoomieiii

I'm using the default UI to set the tank as my Focus. However, if NTK is also running, the default UI gives me a warning message that there's conflicts with the addon NeedToKnow, and asks me if I want to Disable it or Ignore it. I just hit Ignore and do it again, always works the second time.

I'm pretty sure this isn't an issue caused by another addon. My PC just died two weeks ago and I've been playing on my wife's laptop, with only PetLeash running alongside it. I still get the error message.

Actually, according to various addons authors, the focus bug is on Blizzard's end. I've run into it with numerous addons. I believe it only happens when you click on the unit frame and click 'set focus.' If you use the slash command, there's no issue. I'd just set it up in a macro and keybind it.

Power Auras is an on/off thing. It's either on or off. If you want to track when something is fully stacked, not fully stacked, procs you use immediately every time, etc., then PA is awesome.
If you are tracking anything where time is simply 'nice to have' and not required for your play style then PA is good.

If you tend to wait on your procs to maximize potential proc combinations (which it sounds as though you do) then NTK is probably a better choice (based on this preview) for that.
I fully intend to download NTK and play with it tonight as I can already think of some stuff I'd like to take off PA, but it's definitely not taking over completely.

After seeing what Fluffy said, I guess I haven't been using PA to its fullest potential. Obviously there are options I am overlooking. Still a bar timer is probably better for some things than a picture with a timer or however PA would handle such things.

@Jack: if all you are doing with the macro is /focus target, there is a keybinding for that which is not bugged. For other addons (I cannot speak for NTK), it really is about using the menu to set focus instead of the slash command or keybinding.

I don't understand why some people are saying Power Auras is only good for On/Off procs or states. PA has a timer option which makes it very well suited for tracking timed states. I used to use an addon very similar to NTK, but PA does everything that addon does. And while it's nice to have a pretty bar graphic, I'm more of an OmniCC/PA timer style person.

I just realized I've been referring to "Slam procs" on my Arms Warrior. I meant Overpower procs. :P Been playing my Priest almost exclusively for awhile, now, hehe.

Sucks that it's a Blizzard issue. I'll probably just live with it, since I don't really have the room to spare for another keybind. Not a big issue.

I've come across the focus bug as well, but it seems to be very sporadic. I had it with pitbull when I used that, but gladius seems to set focus without any issue at all.

I think the focus thing is caused by "taint" in the menu; bringing up the right click menu on an NTK bar seems to taint the same menu the unit frame uses to set focus. It should only happen if you've configured NTK that run, though, and I've actually never reproduced it.

Hoping to solve the "not enough bars" issue by having combo buff+cooldown bars. That's the biggest cause of bar bloat right now.