If you're complaining about going OOM then GOOD. Then the Developers have done their job! Heriocs are SUPPOSE to be tough and your SUPPOSE to struggle with mana. This isn't Wrath anymore where you can blindly heal anything you want and get away with it. And if you don't like then stop being a healer.
I'm tired of everybody complaining that holy paladins suck or they're broken when they aren't. Your QQing about the changes to healing and the fact the holy spec actually requires you TO THINK NOW!