I see a mix. I use Python, but during undergrad one of the required classes taught Perl. Now at a different university, the local bioinformatics group does a "Perl for Biologists" class, and I know at least one lab that still writes new stuff in Perl to stay consistent with legacy code.
The undergrad class was back in 2011 and just went through the basics using Learning Perl, 5th Edition. I haven't personally been to the workshop here, but from their schedule it looks like they spend several sessions on basic programming concepts then spend one on OOP and hop to BioPerl, interacting with FTP sites, then "practical examples". The lab I know that uses Perl does use Moose though.
