I'm specced into balance for the 9% mana reduction on casts. and im specced for HT/Nourish. They don't heal alot.. but its very mana conservative. I usually don't even need my boomkin friends innervate.
I also just finished my first heroic. It was hard only because it was people missing interrupts and tank not dodging and or moving out of slime etc.
Healing now is not as hard as you make it to be it seems. Sure, the mana cost is ridiculous.. but YOU CAN DO IT. Its not about the healer anymore. Its about the group. (most of you already know this.)