My top tip for an affordable Disney vacation: not a possible thing, but you absolutely would get more *value* for 3 days in Disneyland than you would for 5 days in the swamps at any tier of spending. You will pay more for travel if you're an east coaster, but off-site hotels are in walking distance and onsite hotels are built into the contiguous property, Genie+ actually "works" there if you choose to pay for it, you can eat in park, on property, or off property without the same time and logistics sinks you do in the swamp, and fewer captial T-tourists.
Don't tell anyone this (especially the folks in Burbank) and this discrepancy probably will not survive the decade.
If you want an amusement park vacation, Cedar Point has a great value for a family of 4 with kids between the ages of 8-16.