It's worthwhile to the extent that other people can learn from your experience and get to the good oil sooner.

Personally I learned from The Camel book, the Perl Pocket Reference, the Perl documentation, PerlMonks and a lot of experimentation.

Overall I guess I learned most through my interaction with PerlMonks, by asking for help, by exploring other monk's answers to questions, and by answering other monk's questions myself (which often involved digging around through documentation and exploring solutions).

I came to Perl Best Practises rather late and most of the advice I'd gotten elsewhere, but there were a few new interesting ideas even so. In like fashion Effective Perl Programming 2^nd Edition was a recent addition to my library and also mostly covered stuff I'd already picked up, but is well worth while all the same. Both these books are more useful after some understanding of Perl has been acquired, but before bad habits are too set in place.