We just had a poll (or are still having a poll) on "How did you first get involved in Perl", so my suggestion is the followup to that question, which might be phrased as "Why do you stick with Perl after all this time?"

In my case, I'm (eight years into it, heh) still learning about how Perl works, how certain modules work, how testing works, and about Perl 6, which looks like it's going to be very cool when it arrives (in 18 months .. it's always 18 months away).

Updated:

• I found CPAN
• I found Perlmonks
• I finally got a really good handle on regular expressions (or closures, or inheritance, or Perl OO ..)
• I found out I could use it for CGI scripts
• I found out I could use it for things other than CGI scripts
• I attended a Perlmongers meeting and was impressed with the local community
• I attended a YAPC and felt right at home (or was able to harangue a module author in person ..)
• I got a chance to re-do some horrible old Perl code and had so much fun doing it that I'm here to stay
• I tried some of the other scripting languages but got frustrated. (Indentation, lack of CPAN, verbosity, too OO, not OO enough ..)