I'm a recent WDW addict, and loving this thread, as I need to figure where I can cut back to so I can splurge other places. It's also helping me actually reflect on my actions. Also, I'm trying to be environmentally friendly where I can, reducing/reusing/recycling.
Sometime the budget is as much about baggage limits, time constraints, and maximum trip enjoyment as it is about the actual $$.
Here are a few more, mostly about the food:
DO consider your family's eating habits when deciding if
DDP is worth it to you
I've decided for this upcoming trip it won't be:
---I plan to eat breakfasts in room (milk/cereal/porridge/juice/fruit/bread&cheese). 1st part of stay is at POP, and I've joined a fridge swap. I feel they are fine because of the length of time they've been around: Disney is aware & has not discouraged them
I will be bringing a kettle with auto-shut off as well. This brings a money saving factor, and a time saving factor and enjoyment as well--And consideration for the fellow disney guests as well... I'm not civil until after that morning cuppa tea!

I'll also be having a light snack in room at night as I unwind and plan for the next day.
---I've looked at menus on Allears of places I'd like to dine at, and have concluded there are some places where the appetizers and small plates are what I'd like. I can't eat 2 desserts a day (well I could, but not at meal time). And if I only plan on a few table service meals, I can snack on the special things I see (I want to try the mini corn dogs MK, frozen bananas AK, something decadent at Ghiradellis DTD, and afternoon Tea at Grand Floridian, grazing through the F&W)
---Do realize that sometimes the lunchtime meals are lower priced than the suppertime meals, even tho the food may still be the same.... I'll be booking for Biergarten at the latest lunch hour. This also means to me that my HUGE meal will be fully digested by bedtime, which in turn means a better night's sleep
---I will bring a couple pieces of fruit, granola bars, water bottle into the parks with me for morning snack. This will tide me over til late lunch, and then leave room in my fannypack (yes, fannypack), and will ensure I get at least some vitamins that day. Also, if hunger pangs hit, I won't need to get in a line that might be long or sell food that's really more sugar/grease/$$ than need be. It will get me thru til I get to the food I really want, which might be on the other side of the park.
---Towards the end of your trip, consider how many park days/water park days you have left and consider upgrading to the longest MYW pass you can and getting no expiration on that. Because you know you'll be back. And you know ticket prices aren't going to be dropping.
DON'T
--- eat at a buffet unless 50% of the people in your party are truly hungry and will get your money's worth, or unless it's a character event and you're going for the characters not the food.
--- be a no show at ADRs--if you decide against them, let the restaurant know. It might be me who's hoping to get a last minute table!

--- ride the wild motion-sickness enhancing rides after your big meals (money losing action!)
---bring chocolate into the park, unless you like chocolate fondue in your purse (or unless it's cold out!).

(or you have a banana for dipping!!) ..yeah, personal experience on this one. Fannypack washed out well.