Trust me. It IS NOT rare.
Well, if we're speaking of disassociative / depersonalized states generally, I quite agree. But my understanding is that 'fugue' states refer to a rather rare sub-type specifically characterized by amnesia.
Further, there ARE varying degrees... Leading to missing persons posters for adults who simply wanted to get lost.
Yes, like most things in psychology there is a sliding scale for everything. Generally not considered a disorder until it comes into more acute forms, though.
A lot of that in the computer industry historically. A LOT of that action ends up here. Where I live. The location being NOYB.
Mmm. Yeah I believe that. Seems to me that computers, mathematics, music.. those types of fields where pattern recognition / development, and extreme states of concentration are rewarded, tend to be attractive to -- and indeed, at their highest states, often only navigable by, people who tend to think very differently from the norm and may have some cross over with those at risk for such "disorders."