I go to WDW several times a year so have quite a few favorites.
Portobello soup, mussels, buffalo, and the old berry cobbler they used to have at Artist Point (don't care for the new version of berry cobbler).
Crab gauteu and the old berry gratin they used to have at Citricos
Almond cheesecake at Narcoosee
Napoleon, Pralineige, or chocolate cake from the French bakery
Peanut butter/jelly shake from 50's Prime Time
Tomato/mozzarella salad, mussels, cheese plate, steak, and scallops with pumpkin sage risotto from Flying Fish
Cheese Plate and lamb dish from Jiko (it was the sides that made the lamb dish so good)
Tuna Oscar at Kona
Mushroom appetizer that Rose & Crown used to have
The trio that Maya Grill used to have (steak, fish, ribs, garlic mashed potatoes, and grilled veggies), plus their fried cheesecake
Seafood salad appetizer Yachtsman used to have (the original, not the second version)
Bread pudding at Raglan Road
crab/fish fritters and Surf and Turf (steak, shrimp, plantains, and grilled veggies) at Paradiso 37
Carrot ginger soup at Boma
Quattro pizza or seafood pasta at Via Napoli
Lettuce cups and ribs at Yak & Yeti (Yak Atack isn't bad either)
Mozzarello/tomato salad, antipasta platter, and penna alla vodka at Mama Melrose
Kazan roll, pork loin, or the lobster risotto appetizer California Grill used to have
On a hot day: an Itsakadoozie from any of the carts