Anything is *possible*. I wouldn't imagine that you would get great results, however. You'd basically be playing a Warrior with a healbot. You could probably set up some interesting cyclone+heal macros, but I think you'd get reamed by normal teams with 2 different players controlling the action.

Generally speaking, it is easier for most folks to control the melee character and use the ranged characters as alts. There's no need to even break /follow, in my opinion. Just nuke from right behind your warrior. Druids are nice because you can HoT the warrior while you're both on the run.