We were really pleased with Chef Mickey’s at the Contemporary. Buffets always work well with kids (no waiting) and the food was pretty good. I have heard great things about Ohannas - its on my list for our next visit.
Epcot does have some great choices, name previously. I have heard great things about the restaurants in Canada and England in the world showcase, though haven’t had first hand experience and no idea about how kid friendly they really are.