I would guess from the Perl programmers that I have known (and from my own interests) that you will find the following similarities:
An involvement with or strong appreciation for music.
An interest in abstract strategy in forms such as MTG, chess and poker.
A love of learning for learning's sake.
A large percentage will have read Gödel, Escher, Bach. (although I guess about 40% will be honest enough to admit that they understand about 20% of it).
a trend towards function over form
And for those lucky enough to use Perl everyday for their jobs, an overwhelming sense of satisfaction.
Just off the top of my head. I could be wrong.
-pete
"Worry is like a rocking chair. It gives you something to do, but it doesn't get you anywhere."