Sorry; I misread your post; you appeared to seek an objective standard. You want specific instances. You did not intend to relate your post to mine; they merely approach the same question from different directions.
Um, anyone can throw together a list of stuff he likes somewhat. My vote for top Perler is Michael Schwern; for top contribution, Test::Simple. I consider Test::More the most important module extant. And yes, I've sent him fan mail.
Death only closes a Man's Reputation, and determines it as good or bad. —Joseph Addison