If my strongest heal (Divine Light) critted (for approx 30k) it would empty 10% of my entire mana pool and only heal 1/3rd of a 100k player's bar. My "quick" heal is even worse. 6700 mana (9%) for a 15k heal. That's a drop in the bucket for anyone at 85 with 100k life. 30 seconds into a heroic boss fight and I'm out of mana unless the ONLY person to take damage is the tank and I can perfectly execute holy power / light of dawn discharges.
I got my character geared out in blues to start heroics tonight and tried a few. It was freaking insane. I'll be honest, I'm a damn good healer and I know how to maximize every tool at my disposal but I was out of mana EVERY BOSS FIGHT. Even the ones where the dps kept their damage intake to absolute minimum.
Thinking back to some of my most intense healing, I had sustained about 12k healing per second on a Blood Queen fight (without the vamp buff, but granted this was before the Holy Shock nerf). In the groups I've been doing in cataclysm, even when I go balls to the wall healing, its still only 10-12k healing per second lol. WTF!!!!!!!!!
Put me back at 80 with 80 blues and I would be 3x more effective at healing the equivalent players at that level. Healing is so WTF right now it just makes me laugh.