For the people who don't get to visit often, it makes sense to want to maximize their park days because they may not be back for 3 years, if ever. Many people on this forum are frequent visitors, but not all - and many of us sometimes travel with people whi are in that "once every 3 years at best" group who loon to us for help getting the most out of their limited time in the parks.
Also, SOME of this is fixed by the new system. You have the ability to pre-book 3 rides before your trip AND can select the return times, so that means 3 rides without having to fiddle with the app to pick your next ride or try to improve your return time. No keeping track of "what time did I book X so I know when I can book something else?" or setting alarms on your phone and hoping you hear it in a crowded park or feel it vibrating in your pocket while walking. Just tap in for 1 ride and know you can now book another.