But FP+ has created lines at those that never used to be there so the days of being content to ride Soarin' once and spending the rest of the day repeat-riding Figment, SSE, El Rio, etc. are a thing of the past.
This may be true (incrementally so, if I believe the "studies" that have been done), but how many people really want to ride those repeatedly throughout the day?
I didn't do a "study" but for my Thanksgiving week trip, we did not notice longer lines than normal at, say, Haunted Mansion or Pirates of the Caribbean. I am sure that the "studies" are right, and that the lines have incrementally increased, but in practice, it wasn't so much that we noticed it. It was (if there) unappreciable.
Granted, I didn't try to ride Figment at 3:00 pm. I am in World Showcase by then.

However, if I did try, and found a 45 minute line, I would say that's pretty alarming. As I've said before, I have not only never seen a line at Figment, I rarely have anyone else on the ride with me.
I did notice a longer than normal line at Living with the Land, but I did not know whether to chalk that up to Thanksgiving week (which we have never attended before) or FP+. Typically, too, we're not in the Land pavilion past 10:00, and this time, we were since we had a FP+ for Soarin and did not ride it at rope drop like normal.