As noted above, the price of tickets for the most part "is what it is". That's the one thing you pretty much have to suck it up and deal with it. We're a family of 5 and do things on a super tight budget. We're not poor, but we're also limited in disposable income so we try to make our budget stretch as far as we could. Instead of spending one week at WDW in a fancy hotel there and doing the dining plan, we choose to buy APs, stay off property and pack our food. We get literally 50 days out of our AP pass for about the same money. Here's some details....
We use VRBO to find a 3 or 4 bedroom, 2 to 3.5 bath house for around $100/night including all fees and taxes. Far, far cheaper than any accommodations at WDW, and we actually prefer to be off site anyway. Works 100x better for us than cramming into a hotel room.
We bring almost all of our own food into the parks. It's nowhere near as much work as you may think. Our "cooking" is making sandwiches, putting something in a crockpot, etc... It's my understanding that people who eat on property spend between $50-$100/person per day. Let's take the middle number and say it's $75/day. For a family of 5, $375/day. So for a 7 day trip, you're looking at $2625 for food alone. In the same amount of time, we'll spend around $500...and that includes buying snacks in the parks for the kids and/or desserts outside the parks.
I'd guess that we'll spend $2500-$3000 less per week than most people who go everything on WDW property.