Don't feel trapped, WDW is perfectly fine without them.

We've never gotten a park hopper, and it works out great.
* With our family, a fixed price addition is x6. So that $60 is $360 for us. That's an extra night at a Deluxe or 2 at a Value -- I'll take the extra day or two instead - it's like hopping - but on a whole new day.
* We tend to not hop lands much let alone parks... when we enter the MK, we'll spend the day in a couple of the lands, not cross back and forth. Mostly due to travelling w small kids. Kids can enjoy things more when you base yourself in a land for a while and just enjoy what's there, instead of darting from headliner to headliner.
* Walking. A hop is exiting a park, walking to the transportation, waiting in the bus line, then walking to a new park, then clear into the park. It's a lot of walking.
* Need... I've never been at a park and felt it was so crowded that we would be better off leaving to go to another park. We can always find something to do.
* Early closures... We tend to have planned some hotel-type activity, like the HDDR or Aloha show... so we'll just plan these on days when we'll be at the AK or on an MK party day.
* Staying out late... We always start off thinking we'll stay out till midnight... but... it just doesn't happen. After a midday break, half of our party ends up wanting to just hang out at the hotel. So other than the MK (given we stay at the Poly / Contemporary so getting there is quick) once we leave AK, HS, or EC, we will probly not be going back.
* I suppose if we were to leave one of the other 3 parks, it could be handy to go over to the MK in the evenings, but in practice that wouldn't happen much either. By the time we leave the other 3 parks, we're pretty done for the day.
Overall I think a lot of it comes down to us having more kids than adults. Our planning tends to be kid-centric, which is less maximizing park time and more minimizing transportation time and walking.