Follow breaks, when melee starts. That's the biggest reason melee is harder then casters. It makes them impossible to play competitively in pvp.
Melee works fine as far as boxing goes.
Let's say you have two druids, one is bear-feral spec and the other is cat/heal-feral/resto hybrid.
Cat follows the bear into melee, bear takes threat, cat moves behind the mob and starts to dps.
Cat can heal the bear as needed. Follow breaking when melee started wasn't much of an issue.