There have been many a thread about why Disney is so magical and I think I have the answer. Of course many people say it's the scenery and how everything seems magical. But I think the answer is a whole lot more subtextial. I believe what makes Disney so magical is the fact THAT EVERYTHING TELLS A STORY. The attractions, the lands, and the stores all have a story or possible story behind it all. And in these stories that the park tells, there is always some sort of mystery involved where you can draw your own conclusion.
Some of the tales are pretty simple to understand: the fable that is Splash Mountain, most of the Fantasy Land rides. Then there are some that they just give you backdrop and have you create your own scenario: Matterhorn, SM, BTMR, etc.). And of course the lands themeing always tells a story like Mainstreet is basically just a period piece but you know a story is there. And some of the tales are so complex that Disnoids are still trying to get there heads around them. The most notorious being NOS. It is very safe to assume that POTC and HM are two parts of one really big story, a uique form of storytelling indeed.
And the magic of "The Tale" goes way beyond the "show" elements. The urban legend about Walt being frozen under HM that is another story that pulls you into the magic as well. The same can be said for all the ghost stories and legends about the park.
And I think that is the one thing that sets Disney far from the other parks, Walt gifted the park with ability to tell a story. A story with mystery, intrigue, and of course Fantasy. Makes a weird sort of sense when you think about it.