This is the ESSENTIAL app for planning and surviving your trip to Disney. We were locked into a specific Magic Kingdom visit date with no flexibility - one of the busiest days of the year. But with this app and a subscription to the companion website, we planned out our day and allocated our FastPasses in a way that allowed us to literally breeze through the park.
In all, we did 14 attractions, met Peter Pan, had lunch and a couple of Dole Whips, and shopped for souvenirs between rope drop (8:50am) and 4:30pm. Without running! We were even able to rearrange our touring plan on the fly to accommodate a temporarily closed ride. Even the teenager was impressed with how little time we spent standing in lines.
Granted, you have to exercise a little forethought and commitment, but if you want or need to make the most of your limited time and money, then this app more than pays for itself.
NTBNL about Disney World Lines (TP)