I would imagine, like me, many adults have a nostalgic attachment to PPF. It's "the" Disney ride in my mind. I can't wait to ride it in March and I'll be 42 then. My 70+ year old parents will be along for the ride. Good stuff.
I made sure to get a FP+ for it, and I'm 47 and going down with someone who is 67, no kids. I intend on riding it a couple times, if I can. It's definitely nostalgic for me and a beloved classic Disney ride.
Not at all. My SO and I did PPF at rope drop before. The whole ride I kept pointing out things and saying, "Cool! Look at that!" It's for kids of all ages. I think adults may get more enjoyment out of it as I don't know how many children these days have watched Peter Pan. (not that it wasn't before my time too)
You won't be the only adults-only group. It's a beautiful and fun ride! My husband and I went in 2012 (no kids) and rode almost everything except for the carousel and carnival-style rides (we just don't care for them). Many people take adults-only trips, solo trips, etc...Disney World is for EVERYONE!!! We're taking my parents with us next month (again, no kids). It's fun to be a kid again without someone looking at you funny!