Mark & T/P -
Being a rather long timer, non member, player of P/V, and looking for answers for this question - takes me back to when I was a single digit player to my 20 plus now - and looking at why it is still my number one track.
As I told Gil Hanse one evening at his dinner, when he asked me what was my definition of the best course design I replied that it was one that I could remember every hole after playing it for the first time.
P/V was one of those tracks.
Last time I played from the "senior tee box", it is still my #1 course.