The Magic Kingdom is up against the end f the property because all the backstage stuff is behind it. Cast parking, operations offices, the HVAC, and what used to be the power plant are all back there hidden from guest view. They didn't leave any room to build resorts back there because they don't want resorts back there. They don't want guests seeing all that ugly backstage stuff. With that in mind, putting it up against the edge of the property is actually the best place for it because it doesn't leave any space that they weren't ever going to use anyway. It also allows supply vehicles and cast members get to the park on roads that guests probably don't even know exist. There's even still orange groves back there. There are a ton of problems with the resort layout, but the Phase 1/Magic Kingdom area is about as close to perfect as you could ask for.