We've just got back and found that we ended up eating in mcDonalds every day for lunch (3 days) because it was one of the cheapest places to eat and we knew the boys would eat there as it is a big and rare treat usually. One in particular is a really fussy eater and the little one whilst good at eating usually can get fussy if he's tired or in strange surroundings or if his brother is kicking off about eating.
Luckily they do salads which were OK for me - very few places seem to do anything salady. DS2 (3) all he wanted to eat when asked was cucumber which we had taken some with us but not enough and had to buy more later. They also have melon packets in the happy meals as well as an additional 4th item which were nice and refreshing, we tended to take them back into the park with us and have them as mid afternoon snacks. Other good thing about it was they were usually quite quick - some of the disney places looked like they had long queues.
One evening we drove to the local shopping centre (Val D'Europe) where there is a big Auchan hypermarket where we picked up some bits and bobs, and also a few nice restaurants at the other end. We ended up in a nice pizza and pasta place called something like Restaurant del Arte which was very nice and had a little pizza/pasta kiddie menu.
If we had been there longer we might have gone back and tried out a pasta fast food restaurant that was open more or less opposite auchan. they had big trays of fresh pasta, you said what pasta you wanted and they would dunk a small/med/large scoop of fresh pasta into a big vat of boiling water they had there (think like chips going into oil in a chip shop but with fresh pasta and water so a whole lot healthier!) and then mix it with one of their fresh sauces (quite a few on offer, some standard, some specials I think) and give it to you to take away in a carton that looked a bit like the chinese food cartons that you see on american tv series.
they also did a happy meal equivalent for kids. SOunds weird but having seen it, it's actually a great idea and nice if you wanted fresh pasta to take away. We also tried to grab a pizza to eat in the room from auchan but they had sold out of their ready cooked ones.
Second night none of us were particularly hungry so we just grabbed a sandwich and bit of salad from the casino/relay mini supermarket in the DLP train station just outside the gates of Disneyland. Sandwiches were a bit British Rail circa 1980; I had a slice of their pizza that they zapped in the shop for me and apart from the fact that all the cheese slid down whilst carrying it home it was surprising reasonable for something cheap and cheerful
If you are in the disney hotels they ahve a big but basic breakfast buffet. If you are staying in the santa fe or cheyenne hotels it is even more basic apparently. You might be able to get a voucher to eat in DLP rather than your hotel, they give them out the day before apparently but go quickly as the breakfast is better than the 2 hotels listed above. Queue for our breakfast was about 10 people for the 7.45 ticket, no queue for the 7.00 ticket (but a real shock to the system getting up that early!). However coming out the queues were LONG - like 20-30 minutes worth of queue. Definitely worth going in a bit earlier as you don't want to waste time queuing when you are going to spend so much time in a queue for rides later in the day!