I've only been to WDW but would like to visit Tokyo and Paris someday.
I've been outside the gates of DL but we didn't go in. We shopped downtown Disney, though! We'll do DL the next time we're in CA. It was way too cold and we didn't have enough time.
I have to say, though - I was so disappointed by the motels/restaurants, etc that surrounded DL. I've heard about it being commercialized (that's why Walt bought up all the land for WDW) but you really don't understand it (at least I didn't) until you're actually there.
It was kind of sad and didn't at all give me that magical feeling I get at WDW. Just driving up to WDW, I get goosebumps, but driving up to DL, it was so seedy and gross. I hope when I DO actually visit the inside of the park, it will revive that magic for me.