I tried Andrea's method, and it works well with 3 destro warlocks w/ Voidwalkers, 1 disc priest, and 1 resto druid. For most fights, I'd just start nuking, and the pets would pick up aggro if the mob(s) weren't already dead. Or I'd use a pet attack macro and wait a few seconds if threat was an issue. I have a backup group in the same theme...3 hunters, 1 disc priest, 1 holy paladin.

I play them here and there. Whatever time I get these days to play, I still boost groups through dungeons or try to get max professions.