I knew you would hit the nail on the head Jazz......

Look at a guitarist like Steve Howe. He, of course, plays "Rock" guitar but some of the lines and tones he uses are pure "Jazz". He also plays "Classical" guitar and......well darn it, he's such a great musician he can cross over between lots of styles.

A big difference between Prog and Jazz is the fact that, to these ears at least, the compositions in Prog tend to be more complicated. As Jack says complication shouldn't be confused with better.

I come back to what I said before:

If you like it.magic. If you don't like it......magic too. Just don't dismiss it. If you find the time to look into something you don't, at first, like, you may discover something that is actually a GEM and change your mind. Get someone who does like it to explain why they like it and a whole new world of delights may open up before you.