We preferred the legacy FP system over FP+ as we experience fewer attractions overall under FP+. The biggest reason for this is because we're repeat riders...we like to ride our favorites several times and skip many of the rides we don't like, including many "classics" that some people love. For instance, we haven't ridden Jungle Cruise in a couple of years, we've only done Space Mountain and TOT once and will likely never do them again, we will never experience Rock-n-Roller Coaster. We're hit-or-miss on Haunted Mansion...sometimes we'll hit it, sometimes we skip. But the kids can't get enough of BTMRR and Splash, they'd do Mine Train and TSM more if the lines weren't so long, and they'll ride Star Tours and POTC as much as we allow and can tolerate. For repeat riders--regardless of the attraction--FP+ just doesn't work as well as FP did.
As for the comment about how mainly "abusers" liked the legacy FP system better...we only had one trip where FP return times weren't enforced, and we only rode one ride in an entire week outside of the stated return system. We did learn quickly to maximize the FP system with enforced return windows. Basically, we kept an eye on when we were eligible to pull our next FP, so typically we were able to pull 8-10 per day. We always traveled in the fall, and other than our Soarin' and TSM FPs that were pulled more than an hour or so after park opening, our FP return times were typically 40-60 minutes in the future. Especially at the MK, we never experienced return times that were 2 hours or more in the future. FP was spectacular...we'd get to a land, pull a headliner FP, do something with short or no wait, pull another FP as soon as we could, then use our FP, then do a SB ride or whatever, lather, rinse repeat, as we made our way through the park. There was no criss-crossing, no running. I was the "runner" but while I was pulling FPs, my husband and kids were hitting the bathrooms, getting a snack, or, if we were in Fantasyland, riding the Carousel (because I don't do things that go in circles).
FP+ has made RD more important for us, and the first two hours in the parks are more rushed than they were before. We now know that if we're traveling any time that is even moderately busy, once 11:00 hits, we're going to be excluded from most rides because the lines will be too long for us (more than 20 minutes; 30 minutes is usually our max). So while under FP we knew that we could leisurely make our way through the parks through the day, now we're cramming as much in during the first two hours as possible. So that's a pretty significant change for us. Those first two hours never felt so necessary in the past. We're getting up earlier more days now than we did under the old system.
I should also note that we're a party of 4 and we have two younger kids (8 and 5 now) so we generally don't do late nights. So things like evening EMH or even staying until close if that close comes after about 10:00 don't work well for us. I can see how FP+ is more beneficial for smaller groups or for groups who are comprised of adults and older kids/teens who can keep up with the late nights. But for us, it's a pretty significant decrease in the value we get from a Disney vacation.
). That first hour spent waiting for FP kind of killed us. I researched and tried my best, but it didn't go well. FP+ would've been helpful that day for us. We never got to go on ToT at all, and I hate that we missed it. I won't even admit how long we waited for Indiana Jones. It's honestly embarrassing.
I don't think I have ever, I repeat ever, seen such a huge mass of people in line for an attraction before! Sorry to hear you missed Journey and Tower of Terror there--the ride seemed milder than the others, so from that perspective you didn't miss much, but it was interesting to see the different story going on there. 
