I went through a phase in life, after I finished working as a Cast Member at
Disneyland, when I was tired of the "fake" world of Disney where people were artificially happy and everything was saccharinely magical. Until I rediscovered the parks again and eventually became a passholder. I fell in love again with theme parks as a form of storytelling. On this board, we don't need to justify why we enjoy this vacation setting.
Epcot is not a substitute for visiting China or France. The Yacht Club does not replace New England. Frontierland doesn't replace seeing national parks. Harambe is not a real safari in Africa. So, people should definitely travel and see the world and enjoy new experiences. Disney World might even inspire some of those real life adventures. And the idea of recreating some of those adventures in a family setting is, for me, a very exciting form of art that is no less valid than any form of storytelling.