We loved Confisco's and Finnegan's.....food, service, prices were all awesome.
For counter service, we also enjoyed Three Broomsticks and Leaky Cauldron (as much for the atmosphere as the food quality!...oh yeah, and the Butterbeer!) and Simpson's Fast Food Boulevard.
For snacks, the Big Pink Donut and Brain Freezin' D'oh!-nut Sundae from Lard Lad were super fabulous. A Flaming Moe is a must-do once (its pricey, but you get to keep the cup and its a very cool experience). And Croissant Moon has the most delectable dessert.