Enough said. There were tons of threads about it on Druid Forums. Seriously, what's the big deal? Everyone hits harder than ever. Why nerf something (even if it was unbalanced then) that would be completely balanced now?
Using one spell and just cycling through 4 people (or 5 if you were fast enough) and doing nothing else isn't what we have in mind for a healer and we'd like to change that if possible.
I personally would say that an AoE heal is a different category from a single target heal. Even if there were 3-4 different kinds of AoE spells, I'm pretty sure one would be the best and be the only one used in a situation where you need AoE heals.