Although I have no direct experience of this, former coworkers of mine speak of huge Perl/Sybase codebases in the NY trading houses.
I can confirm this. I know of one brokerage house/bank that has a department devoted to perl
support within the company, let alone perl
development...
I feel that a lot of people, especially newer perl users, equate perl with web development. That's really quite a narrow view - perl is much bigger than just web apps. In particular it is incredibly well suited to all sorts of data migration jobs, data warehousing, etc.
Michael