Make the druid your healer, make the shaman elemental.

People who say druids are more difficult to box as healers simply have no idea what they are talking about. They are by far THE EASIEST healers to box. You simply make a macro that rolls hots and does wild growth on cooldown. Tie it to your dps macro, and do heroics and raids smashing one button the entire time. No thinking involved with the healing whatsoever. Once you go tree, you never leave!