For me, calling MK "Disney World" is not as bad as insisting that the Hulk is at DisneyWorld, or looking to get a photo taken with Spiderman.
I always use Puffs tissues, yet still call them "Kleenex." Someday the fine folks at Kimberly Clark may come looking for me, but in the grand scheme of things, it' not worth changing an ingrained habit.
However, I am not always so easy-going. Do not even TRY to tell me that Epcot is educational, and therefore boring, and therefore unsuitable for children, or teenagers who want thrills, or adults who don't need to learn anything anymore.