When we have an AP, it is always the cheapest one, now the Pixie. We live in Florida, so if we are planning any WDW park visits, we will buy an AP.
We will take a 5-park day trip at the start of buying the pass and a 5-park day trip at the end. We will usually do a day or two in the middle of our pass ownership.
This year, we didn't buy a pass, but went to
Disneyland and California Adventure for 2 days. I experienced the pain of being a non-resident and paying full freight for tickets!
We also have bought Universal APs in the past as well, using the same strategy of getting two vacations out of one AP. We have not had Disney and Universal passes at the same time.
Over the past 20 years, we probably have had 7 Disney APs and 2 Universal AP.
All this probably works out to about 6 days a year in a theme park. Some years more, some less.
We are lucky to live in Florida and get resident discounts. We can drive to Orlando. We can rent or stay in timeshares. We don't need to eat all our meals onsite. Having an AP takes so much pressure off "having to do it all."
The cost of a theme park vacation for us is much less than for some families, but still not inexpensive.