I have six, off the top of my head. There's some repetition with others' lists, and I think it's a bit more "serious" than most. Perhaps it's my mood; insomnia makes me reflective or slap-happy, alternately. Call this my introspective mode.
1. WDW is simply an amusement park, a theme park or a number of theme parks. It's a resort with multiple theme parks, hotels, dining, transportation, shopping, etc. This ties in for me with the myth that one trip to WDW means one never need visit it again because every trip would be exactly the same, a "been there, done that" argument which doesn't necessarily apply.
2. WDW is for children, first and foremost, and families with children, second, and only those folks. This means that all things on Disney property should be designed with those audiences in mind, G-rated and family friendly. Or that people who choose to go to Disney and don't have children are somehow infantilized.
3. WDW isn't a corporation with executives, employees, stockholders, and a business plan. Of course Disney is a business, and WDW's goal is to sell us--consumers (although we prefer the term guests) leisure-time experiences, services, and entertainment. Now, most of us wouldn't trade these experiences. But WDW is a business, with an eye toward the bottom line. Too often people treat Disney as if it is something that shouldn't be concerned with such mundane things as profits, or corporate policies, or growth, whatever. And Disney and WDW has always been a business; it's private space, not public space. This means that WDW (and Disney by extension) can be examined, even critiqued, as such.
4. WDW is perfect, above criticism, because it is Disney and represents childhood, fantasy, innocence, and the like. Or that WDW represents all things evil, as does Disney, BECAUSE it's a corporate entity with a great deal of cultural power. Both are oversimplifications. Same goes with Walt Disney, the man. Not perfect, not evil, not even a perfectly evil genius.
5. WDW is a "must do" for families. This cuts both ways--people feeling pressured to take their children to WDW to be good parents and guilty if they don't. Or people who complain that they "have to" take their children to Disney, and hating it because it a) costs too much, b) is just for kids (see #2), c) Disney is just an evil corporation interested in the bottom dollar. No one is forced to go to Disney--there's no mandatory pilgrimage to the Mouse. It's optional, although I'll also say that Disney is not affordable for everyone.
6. WDW is a place alone, rather than a themed environment which also consists of the interactions between people, both CMs and guests (or employees and consumers, if you prefer).