I've got to vote for the missing "hashes" and the equally missing regex (what do you mean I can't vote twice? This is America...oh, never mind).
Heredocs are also nice. Some of the other listed features are not unique to Perl (I'm thinking array slices). qw is nice (it reduces wear on the quote key on the keyboard).
At that time  the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.
—Igor Sikorsky, reported in AOPA Pilot
magazine February 2003.