There are things about FP+ that I don't care for - not being able to use the app for rotating 4th comes to mind - but overall I think it;s a good system.
The worst fear that people had when the system was announced was that all of the FPs for popular attractions would be completely taken by those making advanced selections, locking off-site Guests out entirely. But that hasn't materialized, for the most part. I've been able to get Soarin' and Test Track same-day more than once.
I certainly understand the resistance to planning out your entire trip down the time you'll ride certain rides every day - some folks prefer to wing it. But many people seem to have a circular attitude. I've had variations on this conversation several times with friends:
Friend: I HATE this new system! I have to plan out my day months in advance!
Me: You don't have to. You can forget FastPass and just use the standby line.
Friend: So my only choices are to choose my ride times two months ahead of time or wait in a long line? That stinks!
Me: Yeah, but... before there was FastPass, you had no choice but to wait in the long line. The lines are actually shorter now, because half the people are in the FastPass line instead of standby, so you can wait 20 minutes in the FastPass line or under an hour in the standby line - instead of the two hours you used to have to wait when there was no FastPass.
Friend: I just don't like it.
Me: Then do it the old way, without Fastpass. Thanks to FastPass taking all of those people out of the standby lines, the old way is better than it used to be, too.
Friend: It was never this bad when I was a kid.
Me: You mean in the Seventies, when there was only one park and three hotels?
Friend: <grumble, grumble, grumble>