I love this argument, which seems to keep recurring around these parts. The idea that if, ten years from now, the kid won't remember the trip to Walt Disney World, then there's no point in taking them. Which is absurd.
Breaking news: Sometimes parents do things that will be fun, exciting, and entertaining for a young child today regardless of whether or not they will remember it years from now.
How about this? If a bunch of parents bringing little kids, and their strollers, into the parks irritates you, then maybe a day at Walt Disney World isn't for you?