I agree with PP regarding buffet and Family Style. It such a bonus that under 3 may have their own plate at no additional cost (although I find Disney portions are larger enough to have plenty to share).
I would recommend that you plan which parks you'll be at each day and make reservations for restaurants in that park or nearby resorts.
Here are some that my 2 little ones liked or we'll be trying in 6 days!
Table Serve Restaurants:
Chef Mickey Contemporary Resort, near MK - Buffet w/ Fab 5
Crystal Palace - MK - Buffet w/ Pooh & Friends
Biergarten - Epcot - Buffet w/ Oompa Band (kids LOVED this)

Akershus - Epcot - Family Style w/ Princesses
Play & Dine at Hollywood & Vine - HS Buffet w/ JoJo & Little Einsteins
Counter Serve
MK - Cosmic Rays, Columbia Harbor House
Epcot - Sunshine Seasons, Sommerfest, Germany (Frankfurter=hot dog + delicious)
HS - Studio Catering Co, Toy Story Pizza Planet (I didn't really care for it, and I didn't like that you eat in the middle of an arcade, but DS3 liked it)
AK - Flame Tree - ribs and chicken to die for!
HTH
