I've been debating bringing my instant pot or air fryer for a similar reason. Have healthy stuff in the resort and keep a snack budget for in the parks.
We have never regretted bringing our crockpot (next trip will be instant pot) while driving to WDW. We love splurging on restaurants at WDW but have cooked more in our villa than eaten out over the years. Every family has their own favorites and type of meal planning and preparation, so YMMV but here are some of our fave WDW villa food ideas:
As previously mentioned spaghetti sauce in the pot - add salad and possibly garlic bread
Also previously mentioned pulled pork in the pot - add coleslaw or veggie tray. We make a vinaigrette slaw at home to eat as is or add mayo for a creamy style slaw - to each their own
My personal fave is the breakfast casseroles made at home, sliced, and frozen in individual baggies - defrost your fave flavor the night before to eat cold on the walk to the buses or heat it up for a hot, easy, satisfying breakfast (or sometimes, dessert or snack). These casseroles are a layer of bread (hearty multigrain/protein bread or white) in a greased dish on the bottom and top with different fillings then topped with egg mixture to sink into the bread. Fillings that we have enjoyed include: cinnamon and maple fried bananas and sausage (think tonga toast with sausage), peppers and onion blend with sausage and/or cheese, and spinach with cooked bacon crumbles and topped with tomato slices. Due to other breakfast options on some days two 9x13 casseroles last a family of 4-6 an entire week.
Blender Boys frappucino packets - add milk and ice and blend. Same for margaritas in the evening - add tequila and ice and blend.
Instant pot HB eggs as is or turned into deviled eggs - I can not ever make enough devilled eggs for the family.
Overnight slow cooker oatmeal (we prefer steel-cut, but rolled is fine too) cooked with a mix of milk and water and fruits, nuts, cinnamon - again using whichever combos your family likes such as cinnamon apple, banana walnut, maple with raisins and dates...
We've done pot roast stews too in the pot - try something like you'd otherwise get at Raglan Road
We use left-over slaw for a cookout meal - remember the villas have access to grills - bring charcoal and a BBQ flipper. (and baked beans)
Things we do when we don't have a full kitchen are: cooked chicken chunks on salad with bread and hummus or crackers and cheese, taco salad with tortilla chips (pre-make the taco meat and just warm it up) and guacamole, tuna salad wraps, and UHT quarts of soup with added veg, cheese, and/or meat to make it more hearty and unique.