I use healbot, but only because it makes it easier for me to see who is low health.
Now with Jamba as an addon it will tell me if a party member is low health, too.
I use macros; I bound some actionbar keys to numpad1, numpad2, etc up to 6.
So numpad1 is like /cast [target=TanksName] lesser healing wave
numpad2 heals my DPSer, numpad3 heals my second DPS, numpad4 heals my other DPS, and numpad5 is my healer. Numpad6 is for everyone to heal themselves with chain heal.
I have been able to do SO much more ever since I made this macro. If I'm too lazy to figure out who to heal first, I just have everyone standing together chain heal and the system does it for me (jumps to the lowest)