I like to say that at the center of Orlando, the heart of their tourism is Walt Disney World. No offense to Universal or the many other options out there, but Walt Disney World helps put it on the map.
What puts Walt Disney World on the map? I'd say the heart of Walt Disney World is Magic Kingdom. It drives Orlando and Disney tourism like no other attraction can.
Of course value is obviously added by the other parks and attractions in Orlando, but Magic Kingdom is truly remarkable. It's in a league of its own with around twice the attendance of its next peers, and that doesn't even factor in millions more guests that park hop in the evening (first clicks tend to happen at the others, and while that might change, that's how it's been).
Even if Disneyland surpasses Magic Kingdom attendance after Star Wars Experience, Magic Kingdom will remain the keystone of the entire Walt Disney World, Disney Vacation Club, and even to an extent Disney Cruise Line.
In terms of sheer value, one park is filling 30 thousand hotel rooms, driving 3 parks to 10 Million+, and selling millions of dollars in real estate.
Magic Kingdom.
The fact they treat it with such disrespect is actually remarkable. It needs massive additions in park capacity, total remakes of several attractions, and several areas need to be rethought.
Disneyland in the last decade has received significant updates to:
1) Matterhorn
2) Big Thunder
3) Peter
4) Alice
5) Space Mountain
6) Outdoor entertainment
And several others too. They're also adding two massive (albeit misplaced [it's fact obviously
]) E Tickets and a new land.
Magic Kingdom has received some updates and love here and there, but a more aggressive approach is needed if it wants to keep pace with 21st Century audiences. New Fantasyland was primarily replacing capacity lost earlier.
They need to start asking what's next for Magic Kingdom. They need to build, and not just hubs for Steve's floating projection characters on walls (that arrogant guy is on my dark list), no they need real capacity improvements and diversity of offerings.
Though I guess you could say that about all the parks, so...