the parks are really beautiful and impressive, esp. Disney Sea park. The japanese have a strong cultural aesthetic which translates to a perfectionism and pleasing layout. e.g. The Queen of Hearts counter service restaurant with amazing stained glass windows, soldier/playing card statues, eat under giant flowers/lights
The japanese have built everything with real materials. e.g. The companion park - Disney Sea - has an italian style port theme and hotel, (much like the original of the Universal Portofino Bay Resort), and to build they imported tonnes of italian marble. You don't see miles of painted gyprock. Miles of tile mosaics in the Arabia Port (with a double decker carousel).
Disney Sea also has a huge erupting volcano as the centrepiece of the park - goes off every hour, on the hour. that whole park is unique and way interesting - with very different and high tech rides. the Hotel Mira Costa is actually part of the park and you can get a room looking over the main lagoon and watch all the shows from your balcony - and watch the park after hours. the Mira Costa is beautiful and luxurious
The parks are kept in beautiful maintainence and tidiness. e.g. think about the poor maintenance in WDW Splash Mountain.
They have better technology than any other - e.g. the Winne the Pooh ride is by far the most popular ride. It is trackless, working on a GPS/LPS and when you get to the tigger bit they bounce up and down, when you get the heffalumps dreamy bit, about 16 little cars are all zooming around in different directions, just missing each other - taking different routes. The robotic Stitch in the Tiki Room works really nicely. (the japanese LOVE stitchi)
they have multi-flavoured popcorn! And they have japanese type foods e.g. gyoza buns which makes it more interesting. The restaurants are very good.
It has great access on public transport - 30min by train from Toyko.
Japanese LOVE animated characters and love the parks. they turn up in droves - and dress up in the most amazing costumes. they are very polite and keep the park tidy and respect everything.
full on parades - their spectromagic goes on forever! they are long and very detailed. (not like DHS Pixar sadness)
Please go google and look at photos!
I will admit the japanese started that Duffy thing - dammit.