Oh! That reminds me, I wanted to talk more about PW:B this article. (ugh and Binding Heal!) I had so much I wanted to cover it got lost in the mass of information. Oh well, that'll get thrown into my first Cata article next month.

But yes PW:B for disc in 5-mans is a way to get people topped off. Usually I'll use it if I feel like I'm falling behind because there is too much damage going out (either designed into the fight or people making mistakes) or because I needed to do something else that takes time away from healing, like kite adds or channel Hymn of Hope. You put it down and then use the time to pump out a bunch of heals on everyone. When I catch up I start focused Smites and then Archangel to make up for the mass of expensive heals (Flash Heals, Binding Heals, Greater Heals, and a round of Bubbles if I anticipate more group damage) I just cast.

That said, if two targets are taking damage I don't use PW:B unless it's a TON. I will swap back and forth and single target up two or three targets even if they're all taking damage. I use PW:B when say... of those 3 targets that took damage, 1 was taking a lot more than the other two so I ignore the other 2 for a bit. Those two slowly lose a little bit more health each second (but not as much as the main target.) When they're finally low enough and I am still needing to deal with target 1 that I dont' want to switch, I'll use PW:B and try to get everyone as close to full as possible before focusing back on target 1.