I have had quite a bit of success with 5x boomkins. 5 starfalls absolutely decimates a team in no time flat, and having the option to instant starsurge down a player is huge. 5 cenarion wards is an insane amount of recovery, and rolling rejuvs is also quite helpful. 5x incap roar, 5x typhoon(meh), 5x stampeding roar, 5 rebirths for when you lose 1 in a bg (instant cast now, restores at 100% hp with glyph).

PvE stuff is a joke as well - I can run thru the lvl 100 elite areas with starfall running and just spamming rejuv around the party and kill packs of 30+ mobs.