Ok... my view.. if it matters.
I love FP+
Here is why...
1) I HATED!!!!! the Sprint for FastPasses. Whenever we got into a park, instead of enjoying the park as it unfolded, I left my family and headed straight to get the FP for the ride I wanted. Thats it, I got 1 ride. Hiked over to Soarin, didn't look at anything, get the passes, likely for many hours later. Then hiked back to the family, still putting on sunscreen near the lockers up front.
... you then started to tour the park, until your FP time came close. Then no matter where you were, you had to drop and go back to future world and go do your ride. Then hike back to where you were. It was more than once when we would look at each other and say.. "I don't care what we do, but I feel like we have been in this same area for hours"
2) Dinner/Lunch conflicts with FP. Doesn't need to be a reservation for TS, we get a 100p FP for Test Track, and we decide we don't want to eat lunch before (stomach issues) so we wait until after the ride. We really wanted to eat in World showcase, so we leave WS to hike up front again, to go to Test Track (which we already ran to earlier in the day to get the FP) and then ride and hike back to WS for lunch, much later than we planned. Now we have a 530p TS reservation, which is screwed because we ate lunch at 2pm, and are not hungry.
3) You get blocked out of even a second fastpass because by the time you rode the first one (or the 3 hour wait) you couldn't get back to the ride for the second fast pass until it was already gone.
New system...
1) YOU pick the times. We plan them around meals, YOU decide which FP is important to you each day, and YOU pick your 3. Sure they can run out, but at least you gave it a shot from your chair, rather than run to TSMM and find out their gone, then double back to Tower of Terror to get those instead. I would rather wait in line for a ride a little longer, than run around a disney park in florida heat trying to get unknown timed fastpasses.
2) The ability to edit and change... I was in line on my last trip for standby at Splash mountain. We had been together with the kids for 5 days already and were out of things to talk to each other about. So I spent the time (about 20 minutes) trying to change a later fastpass (pirates! I think) to SDMT. I just kept working the buttons on the app, and then trying again. It took about 10 minutes, but I manager to get SDMT Fastpasses while standing in line for another ride. Totaly awesome... same day, and only about 90 minutes after the ride I was in line for. I'd like to see you try that with a paper fast pass. Once those covers go on, its over. If I throw away a paper fastpass, then no one gets to ride during my window, with my seats. But if I change a fastpass in the new system, the old FP becomes availilbe to others to use.
3) Broken down rides, and rain....Several times we went to rides that were down for some reason. Pirates opened late one day, and I got to change my fastpass to another of a group of rides that I could get on EVEN IF THEIR WERE NO FAST PASSES LEFT. I managed to ride Soarin because Test Track was down. That didn't happen on the old system. Oce we tried to get on Test track with our old FP and it was down when we returned, later in the day. We wasted all of that running around time with nothing to show for it. Rain.. that one is great, got a FP+ for Test Track in the rain, last hour park was open. When the ride didn't open the rest of the night we got a FP for any ride in any park the next day! Even rides that had no FP availability left... we could have done Anna and Elsa on Tuesday any time via FP just because it rained the night before. (We ended up doing SDMT AGAIN!)
4) Stress... less stress with the new system. For me I prefer to know what I am getting into. Having my FP's done and ready to go, is just simpler for me. I would much rather know what my plan and schedule are for a given day, then to show up at the park and see what happens. For example, I tend to do EPCOT left side one day and right side another. I can plan my meals around it, and my FP's around it. No hope and pray that it all works out ok.
Of course Disney is a lot of things to a lot of people, and we are all very different, but that is my experience and my opinion on it.
... now time to go cash that kick back check from Disney..lol