I think there was some mention before about the possibility of setting up displays based on healer/tanking/dps etc type of game play.
It may be something that will be possible once the layout engine is complete. I'm not sure though what the end result was on the question regarding a healer specific set up.
As to in your face. Thats why I still use healbot despite the glitches. I drag it out of the infopanel when I am in healy mode and place it above the raid frames. This way I can see whats going on as well as how the health bars are looking. As to the overhealing side .. erm .. that I never really look at but I know for a fact that I always top the overhealing chart. Probably because I like erm .. overheal