we are not huge breakfast eaters, so we usually do breakfast in our room- granola bar etc or grab some oatmeal downstairs, something small.
Then we do lunch and dinner, depending on how hungry we are. We like to schedule one sit down meal a day if it makes sense, but with a toddler, we will be changing that plan going forward- more quick service now.
If we do have a sit down breakfast (which we do at least one per trip), then we make it a late breakfast and skip lunch.
There are so many great snacks available, that it really isn't necessary to eat 3 square meals a day.
My sister had one day where they planned to do 3 sit down meals. I don't know how they managed- they did Trail's End breakfast at 7am, Coral Reef lunch at noon, and Sci Fi at 7;30pm. plus the food at TSM 2.0 that night (it was that day they did this). It is a LOT of food. not sure I could handle it all. Even quick service, it is a lot of food sometimes, especially if on the dining plan getting all those desserts.