You’re not following what I said. I said that FP+ cuts the wait times WAY down when you consider only the 3 or 4 major attractions for which you use them. Not everyone spends all day at a park and tries to ride every ride in the place. There are plenty of times in which we hit a park for just a few hours. We walk around, get some food, see a show, and hit our 3 or 4 FP+ selections. In those situations, the value of FP+ cannot be overstated.
I definitely followed what you said; I'm not sure you understood my point.
Almost all of the parks (EPCOT potentially excluded, although that will change in the next couple of years) have more than 3 or 4 major attractions, which is why I said it's especially bad at DHS or Animal Kingdom where nearly every attraction is busy all the time. Magic Kingdom definitely has more than that number of major attractions, they just have a lot of smaller attractions to help balance it out. Even at the MK, though, a lot of those smaller attractions have wait times twice as long as they would have if FP+ didn't exist.
More importantly, you're in a small minority of Disney guests. Of course FP+ is helpful for specific people like you -- it's helpful for me too, because there are a lot of attractions I don't care about. I can just get an FP+ for those that do interest me and not worry about all the artificially long wait times at the other rides. It's terrible for the average Disney guest and the overall guest experience, though. The majority of Disney guests do need to get in as many rides as possible because they don't have unlimited time or unlimited trips.
I imagine that's one of the reasons Disney wants to mostly eliminate it.
TLDR: Of course being able to skip the line for 3 or 4 attractions is fantastic if those are the only 3 or 4 attractions you're going to ride that day. Most Disney guests don't have that luxury.