Hmm, that might be nice for cleaves yeah, but you'll still get owned by a comp that can cc you for the complete game although ret heals should work with that aswell. hmmmmm, should try to run a ret comp some time.
pick up a frost dk too. Basically cleaves either train the druid, in which case the ret can freedom/bop him if he gets into trouble, or they train me, in which case the ret can freedom me/druid can cc the dps while I literally solo the healer.
One tactic that I've found to be extremely useful is to death grip the healer into the dps, and hungering cold all 3 of them. Then, while still frozen, I strang the healer and immediately pop cds on him. Strang prevents him from dispelling the dps, and during those 5 seconds I can get him low enough that he can't worry about cleansing his dps, he's spending every single gcd trying to stay alive. The dps are either forced to trinket, or sit it and await roots/cyclone from our druid.