Disney has increased the amount of fastpasses a lot since the introduction of fastpass+. The system was never meant to handle this many fastpasses, thus the extremely long lines to even get into the fastpass line. I hear a lot of rationalizing about standby line times, time of year, etc. I can tell you that I actually time every line that I’m in for years (fastpass and standby) and there is no longer anything fast about it on many of the rides. As with most things Disney has taken a good idea and exploited it until it is not much more than distraction.
They manage lines very well and have even cut back capacity to keep lines long. A company that does things like that doesn’t really care if you get on a ride “fast”. Fastpasses turned into a marketing ploy to make guest think they are getting more value (soon to be sold to highest payer). This used to be the case. Like the dining plan, it started out great and then got tweaked until it was irrelevant.

I still use them when I can, but overall I don't care for the new fastpass+.