I'll be using the new tree form, but I do have a few reservations, hoever:
1) I will be race changing my Night Elf druid to Worgen, pronto. The indignity of popping my uber CD for those "healing is serious bizness" times, only to transform into a giant pink brocolli spear is just embarassing. It's not a tree, it's a rabid giant cotton candy on a rampage. My Tauren druid is fine, thank you very much.
2) I don't have a problem with most of the visuals, except that when I see it, 99% of the time I am looking down on it from behind. Sadly, from that angle, the posture and the odd torso and leg jointing gives off the unmistakable apperance of a very full diaper. While I was never a fan of the previous model, essentially a cranky and toothless geriatric denuded treant, I would have preferred something closer to a classic Ancient, over the aging incontinent hippy we've been given.
3) No dance. It's embarassing to /cast dance, see the text that you are "dancing with X" only to see your big lug just sitting there, minding his own business. To add further insult to injury, we do have an animation for eat/drink, but between the grunting and the squatting, it looks like the poor thing is desperately trying to fill his already packed diaper.