RE: Disney Sea
I'm generally not a huge Disney or amusement park guy (except for Six Flags roller coasters, at least during my younger days), but I do really enjoy Disney Sea and try to visit whenever I have time. Far as I know, there's no other park like it in the world where these different themes just mesh so well, and I just love walking in being met by the Volcano and the Venice Med theme! I've gotten pretty comfortable in the Urayasu area finding the town a nice change of pace to the formality of Tokyo with a less of need to "dress up" wherever one goes.
As an adult, I've never been to nor do I have any desire to visit Disneyland, of any variety in Tokyo or elsewhere, but I'll keep enjoying Disney Sea, and can't wait to introduce my youngest daughter to the park.