We hate FP+. We have done 1 trip with it, and it really hampered us. We knew we didn't like it, but we didn't realize how much we hated it, until we spent 5 days at DL last week.
The only thing I liked about FP+was having that 1st fast pass of the day that I usually made a run for in the morning, especially Soarin and TSM. Other than that, we hated having to plan our day in advance, having to run from area to area to make our times, not being able to look at the wait times for a ride and decide if we even needed a fast pass; not being able to compare a wait time of a ride to when a fast pass would kick in if we pulled one and then possibly pull a fast pass and do everything else in the area while we waited for it to kick in etc. We hated constantly being tied to a phone, the glitchy app, the inability to change our FP+ based on how the day was going and the standby waits are, etc.
We realized how awful it really was when we spent a wonderful 5 days at DL last week without it. We aren't DL newbies, we have been alternating between DL and WDW. After doing FP+ at WDW, DL felt so much more relaxed and happy. We didn't have our day planned in advance other than our meals. We could do what we wanted in the order we decided we wanted to do it ON THAT DAY. We weren't tied to a FP that we had to use or try to switch, if we got there and the ride had a 10 or 15 minute wait. We just got in the line and didn't pull a FP. More than once (like we used to do at DL), we would walk up to the ride and it would have at 40 minute standby, but fast passes that also kicked in within 40 minutes or an hour, so we would pull the FP, and get other stuff done in the area while we waited for it to kick in. Other than pulling my phone out here and there to check wait times in an area we were thinking of heading too, I kept my phone put away and DD didn't complain I was on it all the time (like she did at WDW with FP+). We didn't run into a bunch of stressed out guests dealing with FP+ or complaining about apps, times etc. like we did at WDW. I didn't get ran into multiple times by guests messing with the
MDE app which happened at WDW. The atmosphere was so much more pleasant and relaxed- it felt like WDW before FP+ and we loved it. We are going to give FP+ one more try at WDW, but if things haven't changed and the parks still have the same feel, I think we will be having more non-Disney trips and we will stick to DL, until we miss EPCOT so much that we feel the need to hit WDW again. EPCOT is the only thing we miss when we are at DL.