Class-wise Shamans work well on summoning mobs, as WarpathEQ says. Slow + Torpor + Cannibalize allows Shamans to face tank summoning mobs while you kill them with DoTs and/or your pet.
One strategy you can try on your Druid (depending on mob resistance) is blind kiting. Ideally you'd want a
https://wiki.project1999.com/Bioluminescent_Orb for this, as it's mana free.
A mob that is blinded will run around as if they were feared while you (and your pet if you have one) are not in melee range. A blinded mob that is running around will not summon. Blind also works on mobs that are normally immune to fear, like 55+ mobs. Blind will work on non-animals too, as Druid fears are limited to animals.
That said, 55+ mobs often have pretty good resistances, so blind may be resisted a bit too often for this to work. It should work well enough on non-animal mobs lower than level 55 that don't have high MR resistance.