I've never spent a day resort-hopping - we usually visit one at a time. I think doing one after another could get a bit tedious.
I don't think you'd manage to do them all in a day. Your best bet is probably to do either the Epcot resorts (Yacht Club, Beach Club and BoardWalk), followed by the monorail resorts (Poly, Contemporary and Grand Floridian), or vice versa. You could also take a water taxi across to Fort Wilderness and Wilderness Lodge.
If you are just doing resorts and no parks, the BoardWalk is a nice place to finish your evening and you'd have plenty of options for eating (although I'm not sure how many of the resort restaurants open for dinner as early as 5pm). We love ESPN, Spoodles and Flying Fish Cafe (all at the BoardWalk), but your choice will depend on the make-up of your party and your dining preferences.