The addon Instant Health seems like a big deal among healers right now. Instead of letting the server calculate health changes it uses the combat log to instantly change the health on your client which let's you react faster. I haven't tried it yet but it seems promising as long as it doesn't slow down fps etc.
I know I haven't posted in a while but there's not much to report yet. Still working on reaching Illidan to get proper tries on him. Hopefully Mother and Council goes down tonight so we can try him tomorrow.