Epcot- Teppanyaki at Epcot; Cape May Cafe if you want to go to an Epcot Hotel (it's at the Beach Club- just a hop-skip)
MK Area- either 'Ohana or Kona Cafe; love 'em both. Whispering Canyon at WL is fun too
MGM- 50's Prime Time
Animal Kingdom- based on what I've eaten at, Tusker House, but I haven't tried the BBQ place yet----that intrigues me as well.
No suggestion for Universal, although I just watched something about Emeril's new restaurant over there and it looks FABULOUS. It's called t-shop-chop or something like that.