Im currently playing a paladin and 4 druids. I leave the 4 druids in caster form and do the rolling ghetto heal over times. I spent a LOT of time working on my macros to the point where I can one button smash for 99% of all occasions. I also built it modular with /click. So if im running a lower instance and dont need heals. I can just 'unplug' the healing button for 3 of my toons. In heroics I have to have all 4 going and in high end non heroics 2 healers are all I need.

Its quite easy the way I have it set up to do this. I use my 2 sidebars and just change the macro how I need by moving or removing spots. Im sure im gimping myself by not useing moonkin form, but so far it hasnt been a big issue and its going quite well.