I lack experience in WotLK on Paladins and Priests. I'll just add my thoughts for Resto Druids.
Fist of all critrating.
Although Crit isn't awesome for Druids, it's certainly not something to be sniffed at. Druids have a fair range of direct healing spells (Healing Touch, Nourish) and HoT's with a direct healing part (Regrowth, Lifebloom). Only Rejuvenate and Wild Growth do not benefit from crit. When 4 out of 6 spells benefit from a stats, it's bound to be ok. But that's all it is, it's ok, but not worth losing other stats over like Spellpower and Spirit.
Then there's haste
I was slightly confuzzled at haste as well, but really, considering the limited choices in gear I have right I get haste as part of the package. Obviously Regrowth, Nourish and Healing Touch will benefit from haste, but the biggest gain (in my opinion) of haste for Resto Druids is that it lowers the GCD, which is nice when you're dumping HoTs on several people. Certainly now that Wild Growth is getting a CD, lowering your GCD (even more) will be a nice bonus.
Both stats are 'nice to have', but certainly not 'must have' for Resto Druids, and indeed, I'd place them very low on the list of who benefits most from these ratings.