There are a couple places in epcot that doesn't have a kids menu. Off the top of my head I know nine dragons doesn't have one. If u go onto the disney website u should be able to look at the menus for all the restaurants.
There are some counter service restaurants that don't have them, like the turkey leg carts, Les Halles, the fish & chips kiosk, Starbucks, Sommerfest, etc.