I know you didn't ask me but I want to weigh in anyway
After having gone many times without FP+, and now twice with it here are my thoughts:
Pros:
-if your only doing a half day at the parks
so say you only want to do an afternoon/evening at the parks. In this case, FP+ is a lifesaver. You have 3 scheduled FP that are locked in, so you know you can walk into the parks at 5 pm and have no wait for Soarin.
Cons:
-the tiers.
Lets take Epcot for example. In the past, we were always able to arrive at rope drop, go straight to Soarin, ride it, grab a FP and then get a FP for Test Track later.
Now we have to choose which ride we want a FP for. And good luck getting a second for a top tier. We were there in late May and tried to schedule our first 3 FP for as early as we could so we could try to get more. Not possible, by the time we were ready for our 4th (1130 with a park opening at 9) only things left were Captain EO and Figment.
Also, WDW has lost its mind and has now included Living with the Land and Great Movie Ride as Tier 1s. Living with the Land is actually one of my BF's favorite rides, and I'm so afraid being a tier 1 is going to ratchet up the ride wait times...which leads me to my next con...
-Increased wait times
Its a real thing. All the days we were at Epcot (including weekdays) Spaceship Earth was never below 30 minutes. This ride used to be a walk on except for maybe around 11 to noon.
Living with the Land always had about a 10-15 minute wait, where as I have ridden that boat too many times to remember and never had more than a 5 minute wait.
Pirates of the Caribbean is never listed below 20 minutes now after about the first hour of park opening. We used to ride that several times in a row without waiting all the time.
-changing ride times
Sometimes this is doable. However, lets say you have a popular FP for like Soarin or Anna and Else meet and greet. Something comes up...someone isn't feeling well, your lunch goes too long...too bad, you won't be able to change the time and you'll just have to lose the FP.
Hmm, I guess I really don't like FP+. Its kind of funny because I really love the magic bands and everything else about them, just not FP+. Having your ticket on the band and access to your credit card is pretty convenient. It was great to be able to swim with it so you didn't have to worry about your room key being lost/stolen. I love the wait time app.