It's Disney...with that said, all restaurants have kids menus (even the Signatures). The only one that comes to mind is Victoria and Alberts at GF only because you have to be a minimum age of 16 to dine there.
PP is not quite correct. There are about 1/2 dozen counter service restaurants which do not have separate children's menus. A note, though, all of the places which do not have a kids menu have very limited food choices, period. For example, The fish & chips shop at England/Epcot is one that does not have two menus...but all they have on the menu is fish & chips. The other places are hot dogs or turkey legs, and the like.
All of the table service places have kids menus.
here's the link to the Disboards thread with all the details about which counter service places do not have kids menus, and details what is on the menus there: