I have to throw my "WTF?!" in as well. What was the point of nerfing heals then? Does this mean that the health increase for DPS was solely to balance PVP tank specs? It doesn't matter if DPS have 80K hp if you can still get 2-shot by a heroic mob. In fact, it just strains the healer even more if DPS pull aggro, because it takes even longer to heal them from the initial hit. That translates to more stress for healers and tanks. I really can't help but think that LFD is just going to suck mightily.

Here's the deal. You've got to keep in mind that the nerfs to healing and tanking were to balance the scaling of healing and tanking. Initially, things are going to be very, very difficult- simply because of gear. We will not have the gear to take these instances at their intended difficulty levels. When we get to Exalted with the rep factions, get some epics, get the high-end enchants and gems we need, the difficulty will come down some.

The difficulty is that essentially, we're trying to do the normals and heroics half naked- no DBM, no enchants, no EJ reccomendations for specs and rotations, no epics.... you understand what I mean?

Look at it this way: when it's been on live for 3 months, we'll be exalted with all the factions, we'll have half epics, and gems and enchants. For a "out of my ass" numbers comparison:

Now:
Healer mana:40,000
Average DPS:15,000
Tank Health:100,000

Later:
Helaer Mana:50,000
Average DPS:20,000
Tank Health:130,000

Just as a hypothetical. The numbers might be and probably are insanely off, but the point is we'll be significantly stronger when we've had a chance to grab epics from rep, and enchants, etc.

Right now we're all like that one moron in a dungeon who has full quest blues with no gems or enchants, and whines when he does 1.2k DPS in a wrath dungeon.

Imagine full groups composed of people doing the equivalent of 1.2k DPS now, and the tank doing 600 DPS trying to down heroics.

Be patient- it'll be much, much easier on live, and you'll be thankful for the healer mana nerf when you're in T13 fighting Deathwing, and he takes 5-7 seconds to kill a well-geared tank if he doesn't get a heal, rather than taking 1.5-3 seconds to kill him if he doesn't get a heal.