You can check out the menu's at allearsnet.com- but here are our favorites. (but we are pretty traditional burger/fries/ type people.)
MK: Peco's Bills is our favorite but lately I've heard great things about Colombia Harbor House.
EPCOT: We always eat at Electric Umbrella because my DS loves burgers and fries.
MGM: Worst place for CS- the Backlot Express is usually always good for us though.
Hope this might help!