That old "right tool" thing usually gets dragged out as a way of saying "I don't want to use the tool you like." Perl is very good at a much wider range of tasks than most languages, and I don't see much point in learning bash programming or vim regexes when you already have a tool that does a great job.
Learn a new tool when you want to do something that Perl is lousy at, like CPU-intensive number crunching or writing device drivers. Or learn a new tool because you want exposure to new ideas (there is a lot of great writing about software development that is centered around Java or C). But don't feel bad about getting things done with tools that you know.