I'm fine with mounts at 20/40/60, having leveled several alts after the level reduction. Everything is quicker, the barrens is suddenly not so massively humongous and bleak, and flying makes outland much more bearable. I don't care that I spent more money on mounts than people have to now. I don't care that newer players don't appreciate the privilege of a mount. I don't even care that my Carrot on a Stick doesn't work anymore.
I do however, care that so many new warlocks are missing out on one of the funnest, lore filled & rewarding chains I've ever done. If I were to reroll my warlock in the current patch, I'd probably buy a normal mount and wait till 60 to do the dreadsteed quest.

I absolutely agree. I am very much in favor of class specific quest chains, with class only rewards. There is a bit too much homogenization of class ability for my taste; I see the big picture though. To counter the class ability splash, class specific quest chains and rewards could go a long way to making a warlock feel less mangy (sorry mageish idk) /shrug. I got the swift flight form and the warlock mount through the quest chains and they were among my favorite. The Warlock mount chain is magnificent and when you first summon that horny fire footed sucker you know you are a force to be reckoned with. Can I haz the cool mount with the bones and fire, please, mister trainer sir, just lame in comparison. At least the chains are still available to those that are not in so much hurry to 80. If the class specific chains disappear that would be a huge hole in the WOW experience in my book.

Yesterday I started my first warlock.

If I train the dreadsteed at 40, can I still do the quest at 60? I'd like to experience it, every Warlock I know who's completed it says how amazing it is.

You guys do realize that there is absolutely nothing stopping you from doing that quest, right? Even if you get the dreadsteed at the trainer, you can still complete the quest at level 60 as intended (or even later on) and get a Feat of Strength for it. Same thing with the epic paladin chargers.

Quite frankly, it's a godsend considering unless you have guildies or friends to help you, completing any of those quest chains is damn near impossible in this post-vanilla world, especially the Alliance version of the charger quest. It might be *slightly* easier now that we have the Dungeon Finder, but finding a random group willing to go out of their way to help for something like that is like pulling teeth sometimes.

you can do the same for the swift flight form for druids
nowhere near as epic but i did it anyway