I think the biggest problem we overcome on a daily raid basis is not that we have trouble healing, but that so much of our heals are 'stuck' behind some other kind of healer's specialty.
WoE would advertise for a Warden specifically because if you are raiding sufficiently to gear everyone up, you aren't raiding WoE, and you need the crit mit buff. Even I admit that's a nice buff for awhile - but a bone they threw us to shut us up, mostly.
Same schtuff, different expansion, though

Good for a large population of Wardens, but not good for raiders.
I'm taking a wait and see attitude to it, not wringing my hands just yet. I don't know if we have enough info to do that, or if we just do it out of experience (lol)
It's funny - you see so much complaint from the 'normal' playing population that everything favors raiders, and raiders (like some of us) see it exactly opposite.