Yeah I was half way through reading this when I realized it was meant for Paladins! Lots of great stuff that was totally relevant to my priest.

I would just like to add something: Using Flash Heal/Flash of Light/Healing Surge/ isn't going to break your mana pool unless you're woefully under-geared, and it is sometimes the correct answer to the situation.

The fast heals let you power a tank through things that simply should not be survivable, like broken CC or an additional group. Even in boss encounters, I do occasionally reach for my Flash Heal button. A cast here and there may be what's needed to save an encounter, and often your group will be surprised that they survived whatever it was that caused you to need it.

Like endless medium heal spam, though, you cannot sustain it. In this case, however, more than a handful of fast heals will mean OOM issues later in the fight. Make sure you don't whip out the heal-bombs when they're not needed, but do remember you have them. I think of them as my fifth healing cooldown.