Yeah ... I'm not sure whether it's a good trait or not! When I was young, I could entirely live in my mind if I was bored (or being bullied) and if I hadn't got a job that required me to "play the extrovert", I'd probably be writing fiction. At a minimum I'd be the introverted engineer that looked at his own shoes when I talked to you.

I still have a fondness for books that I might not otherwise have. Some movies seem to be plucked right out of my mental images (The Hobbit and LoTR movies) but others are really disappointing (Ender's Game was way better as visualized in my head).