It's because a Disney park could open with nothing more than a gleaming, polished pile of excrement and still get multi millions in visitors. The name alone guarantees a certain number of visitors, hence Walt Disney Studios getting more than say, Europa-Park.
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True, but its not quite that simple, as you'd expect a resort with multiple parks in walking distance (TDS and TDL) would have similar attendance figures because they're right next to each other...
To EP's credit though, WDS *just* pips it.