Best scenario in my opinion: IF you are an individual that wants to maximize the amount of attractions you can experience during the day, make your FP+ reservations in the mid morning to lunch time. If you can discipline yourself to get to the park @ rope drop, you can have 2 or 3 attractions under your belt before the masses arrive to the parks. Then, you can happily use your fastpasses when the park has started to fill up and wait times have increased. Once you've used them, go back to a kiosk and see what else you can grab. Good luck