Some line by line critique, and then some thoughts at the end to sum up.
This is absolute genius. This is going to be the hidden MVP of the entire Druid class.
If it weren't for this, you'd basically start by casting spells, then shift to beast form for some melee cleanup. But thanks to this one line here, you can switch to beast form, charge into melee, do some damage, shift back and shift back a space to throw down a control spell, then shift to beast form again next round and reenter the fray. This one little line permits the class to function as a sort of dance between beast and human form, instead of just one or the other.