The short answer

• You don’t need to reserve most rides at Tokyo Disneyland—standby is the default.
• The only ride/show “reservations” are:
  • Disney Premier Access (paid, timed access) for select rides and parade/spectacle viewing.
  • Entry Request (free in-app lottery) for select stage shows and some character greetings.
• Table-service restaurants use Priority Seating (advance dining reservations).
• Almost everything is managed in the Tokyo Disney Resort App after you enter the park; dining can be booked before your visit.

Official sources