Actually, yes I have. And I've found it an absolute joy. Oh, line for line it can take more work to understand. (Though often it is set up so that you can ignore most lines.) But compared to what the same code would have been written out in a more "straightforward" and repetitive fashion?

However there are a lot of people who THINK they are smart but aren't. Working with their stuff can be a nightmare. The difference is painfully obvious once you dive into the code. If you're experienced in Perl, it is usually obvious at a glance.