Ruby is still relevant and people are still learning it. There's some good stuff in there (though I agree I don't understand the "built in" claim) and stuff I didn't know after getting back into it after being away from it for a couple of years.

People that write ruby usually do so because they like ruby (as opposed to just doing it for a job, etc). Therefore, people who write ruby are probably going to upvote submissions about the cool quirks of ruby -- and there are a lot of people who write ruby.

From the guidelines: Please don't post shallow dismissals, especially of other people's work

There are tons of examples, with links to the code, I think it's fairly informative.