Hi I was there two weeks ago. If you miss the 5:05 DisneyResort Bus you can a taxi for $200 dollars eeekks. BUT you have two other option. a) take the train, it goes right to Disney but you will need to navigate your way and with luggage its a pain. B) you take the limo bus $24 to the closest location other than Disney and then hop in a taxi from there..
the limo bus runs much later but just doesn't go to Disney directly after 5pm
Option B is your easiest and option.. I don't like to haul around luggage on the train. have fun Tokyo Disney is the gem of ALL Disney parks!