At the risk of having my character questioned, I'll jump in, and probably right back out. I was alarmed years ago when WDW first started allowing people to make ADR's longer than 30 days before a trip. Of course that meant that for the most popular restaurants you had to make those ADR's 30, then 90 and finally 180 days out. I have no idea right now what I'll be in the mood for on February 15, much less for July 15. I don't understand why being on vacation means I'll have any better idea. The effect on us has been to push us to offsite dining for sit-down meals or just making the most of counter service.
I have only used FP+ for one trip, while the legacy FP machines were still around in October 2013. It was awesome then, because we used it as a backup to make sure we could get 3 marquee rides, but we still mostly used the legacy system then, partially because we switched some of our park days around and didn't feel like messing around with
MDE on our vacation to edit the FP+'s. Looking at a smart phone screen trying to make changes to FPs is too much like work for me. I'd prefer not to ever have to look at that smart phone on vacation except for calling my family. And now, in order to make the most of all these reservation systems, we're expected to know what parks we want to go to on which days 2 months out, have any ADR's already made 4 months previously, and now know which rides we want to experience 2 months away. IMHO, that's 3 steps too far in terms of planning.
With legacy FP we almost never made rope drop, yet still found a way to get FP's for everything we wanted to ride, and standby lines for minor rides were significantly less than what I see reported now. This was after deciding (usually that morning) which park we wanted to go to, depending on weather, our mood, what we felt like eating, etc.
We're going to try to keep our reservations for October of this year, but I'm truly dreading the planning of park days (too bad mother nature can't provide an accurate forecast 2 months or 6 months out), ADR's and FP's. If I am not pleasantly surprised with the positive aspects of FP+ (and I admit there are some - it's just that the planning of it all makes my head hurt), it may be our last WDW vacation for a long, long time.