I started writing a detailed reply, but half way down I realized it might become a booklet project[Which is a very good project idea by the way]
I also realized I may not be able to justice to 3 decades of Perl history in one HN comment.
So the best I can do is point you out to two links.
http://hop.perl.plover.com/ and http://onyxneon.com/books/modern_perl/