FP+ = Wake up at 7AM 30-60 days before the trip to pick 3 FP/day. Except your first day, was the last day of another person's trip and you couldn't get a FP to the #1 ride at each park. Then spend every day up until your trip adjusting your FP selections. Then continue changing passes during your trip, and pick another one after your initial three/day.
Genie+ = Wake up at 7AM the day of, pick the best FP available. Make changes during the day, and pick more as they are available to you.
It's basically the same, except here everyone gets the same chance day of and you don't have to pre-plan your entire day months in advance.
Maybe I need to experience it in person, but I don't see the big deal. Rope drop #1, pick the best available LL after. ILL the ride you can't live without.