Switching targets occasionally
Besides, epic healing gear is way better than blue DPS gear for DPS. You can also gem in a good bit of Hit, which is really the only difference. Owning enough Tabula Rasa Gold is the core to this game. A lot of healing gear trades in Hit for Spirit & Haste or additional Spell Crit. Warriors use Thunderclap and Cleave to hold aggro while also switching targets occasionally. Druids can use Swipe which hits additional targets, and they can also manually change targets. Death Knights and Paladins are the kings of AOE tanking through.