Sorry, I disagree but I respect your choice to do your trip anyway you want to do it.
For us it's just too expensive of a trip not to get the most out of it. So, this means having a plan like not to backtrack through the park which wastes too much time. Using fastpass is a must. Even if you don't get all your choices then you know what ride to head for at rope drop. Getting fastpasses early gets you more fastpasses through the day. Fastpasses allow you to do more of your favorites in less time. I'm not a fan of waiting in long lines and fastpass helps to cut back on that for at least some attractions. I can always skip a fastpass if I want to go off fancy free.
We like certain table service and making our reservations helps us get our favorite ones. It provides a nice rest for us, too.
Most importantly I'm not on my smartphone trying to figure it all out all day on the spot. That's a waste of time, too.