I wouldn't say Disney has ruined us for other parks, but there are levels of effort we'd put into going to them.
We'll travel long distances (across the country, or even internationally) for Disney. We'd probably travel across the country to go to Universal (but absolutely would never skip Disney on the same trip). We used to live in S TX, and happily spent many weekends at our local SeaWorld (including Aquatica) and Six Flags - those are both places that we like to visit, but probably wouldn't travel more than an hour in the car for. (I'd travel a few hours by car for Schlitterbahn.)
I'd like to go to Cedar Point, Busch Gardens, and Dollywood sometime, but we'd only go if we were already in the area for some reason.
We're (unfortunately) currently in WNY, and wouldn't cross the street for any of the parks (including water) anywhere around here.
I've never been a fan of carnivals, but especially after having lived a couple miles from SeaWorld and Six Flags, I can't even bring myself to go to a carnival. And I agree with previous posters that most local fireworks displays are very underwhelming (after having gotten used to the 4th of July displays in Boston and NYC, and the displays at Disney).