I'm glad your python experience is working out for you. My experience with major rewrites is that they tend to put a company out of business. So best of luck. However I don't believe the fact that Perl wasn't working for you any longer is proof that "People just aren't using it for anything more than 10-line throwaway scripts." Additionally, the existence or lack of existence of a Perl version 6 has not stopped the majority of working Perl programmers from continuing to improve and modernize the language they are using everyday. Perl, built around modern technologies such as DBIx::Class, Moose and Catalyst (see http://www.enlightenedperl.org/project.html for a good starting list of newer Perl projects intended to modernize the language) is powering many high traffic web sites. For a good list check out:http://dev.catalystframework.org/wiki/sitesrunningcatalyst
Highlights would include BBC iplayer (getting millions of regular hits).
So people are building new, high traffic websites with modern Perl, and continuing to add on and expand their existing Perl based websites. So if you already have a big Perl codebase, this is a great time to get involved in the community and see what we can do together.