These are my family's favorites...
MK - LTT (lunch because of the Ooey Gooey Toffee Cake)
Epcot - Via Napoli (L/D, the arancini and Coppa di Brutti Ma Buoni sundae), Le Cellier (L/D, cheddar cheese soup, pretzel bread sticks, and risotto)
DHS - Sci Fi (L/D, fried dill pickles), Hollywood Brown Derby (L/D, Cobb Salad)
AK - Tiffins (L, Taste of Tiffins)
DS - Raglan Road (B/D, Scallop Forest, Jaffa Dunbrody Kiss), Morimoto Asia (D, Duck Ramen)
Resorts - Narcoossee's (D, Lobster Bisque, whole steamed lobster, cheesecake)
For snacks...
MK - Dole Whip
Epcot - Karamel Kuche (caramel corn), Les Halles (pretty much all of the desserts)
DHS - Popcorn
AK - Kusafiri (cupcakes)
DS - Amorette's Patisserie (mini-Mickey Mousse dome)
Resorts - AKL (Zebra Domes)