Rather than specific meals/snacks, here are strategies for saving $$:
Kid's meals for adults
Shared meals
Entree without sides
Appetizer + dessert, no entree
Table service for breakfast and lunch, counter service for dinner
Research menus before you go
Disney Menus
Use Mobile Ordering to make your selections without the rush at the cashier stand
Pack:
Small plastic sandwich box and/or baggies for leftovers=evening snack or next-morning breakfast
Flavored drink powder for free ice water
Snack packs and bars
The biggest difference for us is the 3 full meals with gourmet expectations DP mind set vs. 2 quick meals plus a special snack and more time for rides OOP mentality. When we don't build our days around getting full value from the DP, we move much faster. Nothing wrong with building a Disney trip around food; it's just not a priority for every trip.