One useful macro that is widely used is the deliverance macro that changes the skills on your hotbar from inner beast to fell cleave and steel cyclone to decimate.

I also have a macro for every single one of my DPS skills on my healers, which means that if the target is invalid, it will cast it on the targets target (so I can stay on the Mt and DPS), as a healer I'm not really worrying about optimal DPS so having these as macros seemed ok to me, though if that's wrong I'd love to know.