This is true, but talk about stripping the theming away and then what are we doing here? Why would anyone both to travel to Orlando? It would just be 7 large parks with a few big coasters and a bunch of boxes with rides inside. Not that that's not what it already is anyway, but it's not what you see in most places. The theming hides the boxes, so it at least gives you a sense of immersion for a bit.
Basically what i'm saying is imagine if Hogsmeade had been built with Forbidden Jorney, but Hogwarts wasn't there. It was just a box. That takes away from the experience, no? Hogwarts is the big "OMG" moment for so many people.