Y'know, I really do wonder if it is just the way my brain is wired.
I don't enjoy reading fiction, I don't read often, but when I do, it is always non fiction. Again, I sometimes wish I could experience the feelings that some people describe about getting lost in a good book etc. I really have never experienced that.
Music does it for me, or at least some types of music. I play at a professional level and mostly play for enjoyment these days. I love that the music I play is very informal and I can just sit down with other musicians I have never met and play tunes with them - even at a paid gig. Sitting at home playing on my own is not really terribly exciting. The music I play has structure though, jigs, reels, marches etc and I love the way that two people can play the same tune, with the same notes, but they can play it totally differently. I am also interested in the names and history of the tunes and the regional variations etc
DS1 is really similar to me. From a very young age, he was clearly interested in facts and figures. He really didn't do very much imaginative play (thank goodness, because guess what, I hate it!!). DS2 is a bit more imaginative, but not anything like as much as some other kids.