This is how it works for me, may not work for you or anyone else (kinda like talent specs, ui setups).

My healer has 0 spells bound, they sit there and heal...that's it. They only have the /follow macro bound, and a key bound to smartbuff for buffing. If I want to keep dpsing while they heal, I simply mash a dps key and drag my mouse over to my healer and click a bar in healbot. Easy.

Paladins make this very easy to do.