We returned 2/18 from a 10 day trip and we felt the same as above. It wasn't always convenient or possible to schedule FP+ times where we wouldn't have to criss-cross park, and while there's always stuff to do around us, there isn't always something we WANT to ride/see in the area during the waits between FP's which were pretty often. It's just too far in advance to know exactly how your day will be and too much of a pain to move things around right there and then, especially when the app only works 50% of the time

Some days our FP's were gone by 1 or 2, and lines were long. Other days when our FP's were scheduled for our 2nd park, even if we got to 1st park early, lines were too long by 11 or so and with no legacy FP, what do you do?
Also just another note, we rarely wait over 20 min. for a ride; sometimes 25, MAYBE 30 depending on what it is and if its our last day in the that park, and of course there have been exceptions over the years. In the past, 25 min. or more would have definitely been a grab-a-FP ride. Our trips are usually in Oct./Nov. and we've always had many waits of only 10-15 min. on many rides at different times of the day, so I don't think it's unreasonable to at least hope for, depending on the time of year you go. Unfortunately I think FP+ is definitely making those short lines less of a possibility. We did see some 10-15 wait times on popular rides this month, all before noon.