To be honest, almost everywhere is expensive to eat at
Disneyland Paris....! With the Euro as it is, Id take as much as you can, then whatever you come back with is a bonus. You dont to leave yourself stuck with no cash for dinner!
Are you going to see Buffalo Bills show? That way you get the entertainment for one night covered and get a meal included too!
The Rendez-vous des stars (ratatouille) restaurant in Disney Studios is great for lunch or dinner. Its about 30 euro per adult (which is good value for DLRP) and its all you can eat buffet salads, breads, pasta, meats, dishes like pies, curry, stew, desserts (loads of choices) fruit salads. We always eat here and you get a soft drink in the price too!
Or theres a McDonalds at the far end of Disney village if you're that way inclined. I havent eaten there but I know it's more expensive then UK McDonalds.