Imo you can't focus to much on aoe since this has quite some downsides.

1. main point. You need to gather up the mobs you want to aoe, which isn't always a good option.
2. Aoe costs a lot of mana with the boomkin.

I would never spec the second char doomkin, since i can't imagine him not going oom like hell. (yes, i know innervate exists. But a couple of hurricanes drains a lot.)