Practical observes that a lot of the later problems with healing in Cataclysm might actually be the result of a surfeit of raid fights that required constant stacking, and the inevitable effect they had on certain healing spells' being too powerful. Having recently looked at healer numbers in Dragon Soul, I'd also venture that AoE healing spells that aren't numbers-restricted (for example, Circle of Healing versus Holy Radiance) on top of that raid stacking are making healer balance look worse than it actually is.
So what are your thoughts, healers? How did healing work out for you this expansion, and are you looking forward to the Cataclysm changes? And are the problems we're seeing really the result of healer mechanics or raid design?