It's pretty standard Magic Kingdom. It has a fast pass system, but you can only get one every two hours so you still have to wait in line for ages for some rides. Over-priced, rubbish food. Constant happy music everywhere. The actual areas are exactly what you would expect, just with ultra-polite Japanese attendants everywhere.

I've been to Magic Kingdom in Paris and Florida, and it seemed pretty similar to me (although both were a long time ago). The main difference is Disney Sea, which you won't get anywhere else. It's basically "non Asia" themed, and has a Mediterranean area at the entrance, an American area with a light rail and Tower of Terror, a Jules Verne themed area that is pretty awesome, an Arabian-themed area and a Jungle area.

Anyway if you're not going to go all this is pointless. Just read about it on Wikipedia.