I don't know if there is a place in Epcot I've been that I wouldn't return to - not in the past ten years.
I wouldn't order what I had at Alfredos, but I'd go again for different food.
We consistantly return to Marrakesh, Le Cellier, Teppanyaki, San Angel Inn.
We are really lucky in that where we live we have access to a lot of food styles. Teppanyaki is a lot like a Benihana's and you can get a good steak anywhere (and I live 20 miles from Wisconsin - the epicenter of beer cheese soup). Marrakesh is probably the hardest type of food to get at home - I can do similar, but not the same locally.
My favorite Disney restaurant currently is out Epcot's back door - Flying Fish.