For better or for worse, Disney is leaning hard into technology, and at least one person in your party is going to need a smartphone to be able to tour the parks efficiently.
Get Ready
Download the My Disney Experience App and sign in
Functionality
A full discussion of what you can do with the My Disney Experience app (MDE) is beyond the scope of this guide. The features I find most helpful, and that you're likely to use the most, however, are as follows:
Making Lightning Lane reservations
Joining Virtual Queues (a/k/a obtaining a Boarding Group)
Dining Reservations
Mobile Ordering at Quick Service restaurants
Park Reservations
Reviewing PhotoPass Photos