I think the whole FoL vs. HL thing really hinges on playstyle and situation. The first couple of times I healed instances (I think SM was my first) I overused HL, and had mana issues. Not really surprising when you're in your 30's, especially if you have talent points spread across the trees and not concentrated in the Holy tree. As I moved up and learned from experience, watching others, and reading various fora, I became more of a FoL spammer. This was especially helpful when my mana pool was still fairly low, it helped me save mana for when I really needed it. Now, with a much greater mana pool, and much better healing gear, I mix it up a lot more, depending on the situation. If FoL spamming works, I'll go that route, but if it doesn't, at least I'm finding that my mana lasts longer due to my gear.