There's tons of options besides burgers and pizza. There's sandwiches, salads, barbecue, tacos, wraps, fish and chips, plus all of World Showcase.
ABC Commissary may have one (doubt Backlot Express does, since they're outdoors) but eating there is rarely recommended around here. I'd get a sandwich at Starring Rolls or else head over to either an Epcot resort or World Showcase.