I've been to the Disney parks (both WDW and Disneyland) more times than I can count. It never, ever gets old. I was a cast member at WDW in college in FL (I worked there to make $$$) and my wife is currently a hotel front desk lead which is our only income right now. It's a great company that is (unlike most) true to its vision and treats its people well. They pay our medical costs right now (long story) they mentor and develop their talent from within and they really do try to create a positive experience for their guests/customers.
I agree that one shouldn't depend entirely on those sorts of parks and try to get exposure to other things as well (National/State parks, beaches, historical sites, etc.) but they're certainly a success story more than any sort of failure. As Rob said above, I don't see how ANYONE can be a hater on Disney - it's one of the very few examples of positive thinking and good intentions manifested in a successful business. Yes, it has its flaws (cost, a certain amount of "phonyness", shameless over-marketing, etc.) but when you look at the overall package, the entire Disney company is a resounding example of good things triumphing over more of the same old blah out there.
It's also nice to be able to go to a public place without having to see or listen to a lot of thuggish and arrogant
pr!cks - the crowd there tends to be a bit better and more family-oriented than you find at your run-of-the-mill movie theater or fair, better behaved in general and not prone to using profanity every other word, wearing juvenile sexual innuendo t-shirts or other low-brow nonsense that you tend to get WAY too much of in society-at-large these days. It's somewhat insulated from these things, which is nice. It helps make the experience special.