@onelove8187 that was a very good post. I'd suggest some paragraph breaks to make it easier to read.
The point you brought up about people in the standby line being in two lines at once is the reason why FP slows the standby line to a crawl. However, it is likely that you end up waiting the same average time for both rides.
The biggest issue with FP+ is the headliners. For some of them it is near impossible to get a FP reservation unless you are booked for a relatively long stay at a Disney resort. As a passholder who rarely stays on property (and sometimes doesn't stay anywhere nearby), it makes it impossible to ride things like FoP in a remotely enjoyable manner. Standing in line for 3 hours that moves at the pace of a dying snail is not fun for anybody. On the rare occasions that I could score a FP for FoP, if the schedule could be worked out I would make a trip up to AK for the day just to ride it, hit a couple of other attractions, eat and drive 3 1/2 home.
Last week I waited 1:04 in the line for FoP and, because it was continuously moving, it didn't feel nearly that long. I could have easily done another half an hour without taking away from the experience.
It's a tough thing because the root of the problem is attractions that 90%+ of guest want to ride don't have the capacity for all of them to ride in a day, FP or not. The only way to change that is to reduce the number of people in the park.
To me, the better guest experience would be to raise prices to equalize the revenue but limit the capacity so that everybody who wants to ride an E-ticket can do so at some point in the day. For whatever attraction is the limiting capacity use virtual queues to limit people to one ride per day (apply that to any attractions that are close to the limiting capacity).
It is insane to me that, no matter what system is used, there are people who purchase a ticket for Disney Studios that are unable to possibly ride RotR. There aren't enough hours in the day multiplied by the hourly capacity. Either the rides need to be built to handle the crowds or a system needs to be used to limit the crowds so this isn't the case.