When I was in the newspaper biz and would get a chance to write about WDW (usually because a local team had played a game at WWoS), I'd write something like "the Walt Disney World Resort
near Orlando." It felt like the best mix of brevity and accuracy that I could come up with for a general audience. Since it always bugs me that most reporters just toss off something like "Orlando's Disney World" when they mention the place, I really tried to put some thought into my references.
Speaking of the odd mix of political entities that make up WDW, you can buy two Cokes exactly the same size in two places on Disney property and pay different prices. This is because Orange County and Osceola County calculate different sales tax, and Disney property straddles both.
(This was at least true at one time.)