I totally agree with this. We live the next town over from a Six Flags and we have season passes. Yes, general admission is half the price of Disney, but the standards of upkeep and entertainment at Six Flags are not anywhere even remotely close to Disney standards. It's expected rather than exception to see things like litter along the sides of walkways or peeling paint on the attractions or surly employees. There is a whole section of (IMO wasted) space devoted to pay-as-you-go carnival games that most people walk on by. Almost all of the queues are outdoors and there is very little shade in the park in general so there's no escape from the sun. Then if you have little kids, your fun potential is cut by about 70% because most rides are for bigger people. The one big perk at our Six Flags is that the water park, which is a decent one, is included in admission. When we go, the kids typically spend several hours at the water park, ride a few rides in the main park, and we're done, since there's nothing else to do or see and nowhere you can just sit and hang out.
This is why we pay thousands every other year to go to Disney when we have a Six Flags in our backyard.

I know people on this board say not to compare Disney to "other" amusement parks, but that's in fact the model that Walt Disney was trying to transcend so I think comparisons are natural and necessary. If Disney ever sinks to the standards of our Six Flags, that's when I'll know they're in big trouble and when the trip to FL won't be worth it anymore.