you can find good food at disney, it just depends what you want to spend. i am a big fan of character lunches and would highly reccommend you do at least one. your options are:
princess lunch at the auberge - pricey but great food and lots of princess interaction. about 59Euro per adult
lucky nugget cafe - yummy buffet with wide range of food, great character interaction (mickey, minnie, smee, hook, goofy, pluto etc)about 30E per adult
cafe mickey - same characters as above. you can either do their set 3 course menu for 30E per adult, or do as we did, share a pizza and small cesear salad for E25 for two people!
other than that, it will cost about E10-15 for lunch each day at any of the counter service places for a meal deal of pizza/burger/sandwich etc, drink and small dessert item.
we stayed at davey crockets so ate dinner in our lodge so don't know as much about dinners - but we did have the favourites menu in annetes once which was good value at 17E for a burger and pudding.
Buffallo bills was great, and we really liked the food which we felt was plentiful. chilli and cornbread and nachos to start followed by ribs, chicken, buffalo wings and potato wedges to follow, and apple pie and ice cream for pudding, with as much coke/beer/water as you can drink. well worth it in my view.
where are you staying? if it's in a disney hotel take full advantage of the early magic hours to have an early breakfast, and get the rides done. have you already bought your tickets? it's likely that you will have 2 park tickets which means you can go back and forth which works well. i would say you would need more than a day in the studios, but it depends whether you are more into the rides (crush, aerosmith, etc) or the attractions (stitch live, annimagique, etc) also we found that it was easier to meet the characters in the studios - which we really enjoy.
i'm very jelous - i'm sure you'll have a great time!