I stand by my assertion
Perl wastes memory so quickly that if you have to think hard about memory, then Perl is the wrong language. Your description doesn't contradict that - you're just outlining how Perl can fit into an infrastructure where some bits are definitely not good fits for Perl.
As for being a polyglot, I have to agree with you about the advantages. I just haven't put out the energy to be one. Perl isn't really my only language. I can read a number of them, and have written toy programs in quite a few. In order of decreasing frequency, at work I've done Perl, SQL, JavaScript, VB, TCL, PL/SQL, DOS, sh, C, and C++. (I may be missing a few. And my C++ was limited to editing a list of known characters in a data structure.) But I'd only be confident in answering questions about the first three.
If I was more motivated, I'd fix that shortcoming. But I'm not. Among other reasons I'm not because I'm painfully aware that I have the wrong personality to enjoy software development. So at some point I should really do something else. (That said, I don't know what I'd prefer to do...)
Cheers,
Ben
