I don't really know if I could pinpoint anything specific. I'd first have to have something that I could compare WDW to for reference, but there really isn't anything like it. The closest option I have is Cedar Point, which really isn't comparable. Now, when I do Cedar Point I stay on site for free (my parents have a boat), the tickets and in-park costs are comparable to WDW's, and the thrill rides are spectacularly better than anything the mouse puts out. But the food sucks, shows are basically nonexistent, workers clearly would rather not be there, the park is dirty, my daughter and husband actually can't ride most of the rides, there's rarely fireworks, zero 'magic', you can't go there during the winter (and you wouldn't want to), and there's nothing offsite worth seeing (unless you're really into off track betting on harness racing). And ultimately, it's ONE park. So basically, in order to stop me going to WDW, Disney would have to offer a product that is inferior to what I get at Cedar Point.
I'm really impressed at people who say they can travel to Europe for less than a WDW vacation. My last Europe trip was more than twice what I usually pay to go to WDW. I'm by no means rich, but I consider WDW to be a cheaper option trip to be taken in between more expensive vacations. I mean, international airfares alone are killer! Perhaps it's having multiple kids that makes a difference.
Edited to say, I really do like Cedar Point! It's a different experience.