Perhaps at the core of this just how many what we called regular programming tasks are just knowing how to work with text and unixy operating system. Perl is just unbelievably awesome at this. Another big edge of Perl is commitment to backwards compatibility, most people who learned Perl early in their careers decades back can use it on-demand basis. Its universally installed, fast and scripts written from the earliest days continue to run with 0 changes, despite endless OS upgrades.
Early enough in the timeline Perl was full unix hackers, and you learned a lot from them, this culture further bolsters Perl's productivity credentials. Not a week passes, that I have to whip up a Perl script to do something for someone has a 2 people and a month budget to do. And they are often amazed it can be done this quickly.
CPAN is another big edge Perl has. No other language apart from JS/npm ecosystem has anything close, and these are basically competing in very different domains so to that end CPAN really doesn't have a competition till date.
If you are looking to build using Perl do checkout the Camel book and HOP by mjd.