For me, I'm going main spec shadow till Disc is once again useful. Right now it's just not fun for me. I enjoyed it very much all though Wrath. I never did like Holy spec much.
Also this bubble spam style, I never did that unless it was needed. Great example, Lich King's Infest. It pretty much rendered Infest useless against anyone that you shielded. Other then that I kept the tank shielded and anyone who was getting low on health to give another healer time to get a heal off on them if I didn't get them healed. Like all priest kept PoM bouncing around. I could also solo heal the tank and myself using Binding Heal on Sindragosa and not worry about the Mystic Buffet stacks on myself in 10-man. Unchained Magic was the only thing that rendered me useless for the most part.