We just did FP+ for FoFP last Thursday & loved it! It is in the sun, but the view & photos with castle is sooo worth it. We arrived around 2:20pm, they lets us enter around 2:35pm, pre-shows started around 2:45pm, actual parade around 3:15. Plenty of space.
FWIW a family across from us had arrived around 2:10pm for front row access. By the time the pre-shows started & the parade was in route, the poor family had been pushed together & were in 3 rows after everyone who did not want to get there early came down the castle ramp. It was disheartening to see adults do that to someone, especially a family with 6 kids.
So for peace of mind, space, & not wasting time for a good spot, FP+ is worth it. After FoF we booked our 4th FP+with no problem. Only SDMT & Elsa/Anna not available which we knew, & most had times immediately available.