Alright. I have to come out and say a little. I live in Florida, have a Annual Pass to both USO and Seaworld, and I frequent Disney A LOT (4 times in the last 5 months). Both parks (USO and Disney) are different places. However, they both sell food, both have rides, both have employees, and both sell tickets for an astranomical amount. They both have on-site resorts, and offer different food options. Both have outside "entertainment areas" (DTD and CityWalk), and of coarse, both charge for parking. Both require a bit of walking, yet offer fastpasses to ease it all up. You wait in lines for attractions at both places, and always, in the end, pick up a souviner or two.
Now you may wonder where each is different. Disney is bigger, yes, true. Universal doesn't have as much land mass, resort numbers, nor number of parks. Yet people still go. It all depends on the person, in my opinion. Some people enjoy inverted roller coasters that are offered at IOA; some enjoy Shamu at Seaworld, and, of coarse, some enjoy Mickey at Disney. Now I know Disney is known for having it's spark of magic -- and that's what drawls a lot of people's attention.. however, at both USO and Seaworld, if you ask, you can recieve that same amount of employee attention -- their desire is to make your trip worthwhile so you will come back again.
True, Disney is typically for younger kids, or, those who are kids at heart.. and USO is for a bit older kids, and those who wnat to do more thrilling rides. However, I, many times see quite the opposite at both parks. Disney may hold an elderly couple who is walking through Main Street, watching the castle. A photographer come sup, snaps a picture and they smile. And USO, may have a young child who is barely three, watching upwards at the soaring Dueling Dragons in awe -- maybe one day she will get to ride it.
Personally I believe all parks are brillant -- it takes time and effort, and yes, lots of dedication to run them all. They have different themes, workers, and ideas -- but, like I said in the beginning, it all depends on the person, and what they enjoy most.
Just my two cents.