We went to WDW last year ( and are returning next Friday, yaay!)
My children were 9, 6 and 3 last year - we were very pleasantly surprised at the variety of foods available, I was expecting chicken nuggets every day!
There were salads, sandwiches, pasta, pizza, whatever you like really.
heck out this website - it has menus for ALL the eateries in WDW!!!
http://allearsnet.com/index.html
We stayed at Port Orleans Riverside in WDW, and the foodcourt there was excellent - as well as counter service foods, you could take sandwiches, salads, yogurts, fresh fruit etc etc back to the room if you preferred.
Any more questions about wdw, I'm your woman - I could bore for England on Disney - and frequently do!!