I certainly found this interesting and implemented the node.js package[1] in a project just now. I found it super easy to use -- much moreso than minimist[2] or commander[3].
I certainly didn't know about it. I had the exact same issue with argparse as the video on the page showed, I always had to look of the documentation to use it or copy and paste it from old scripts to get it to work. This is soo much better, I don't think I'll use argparse again.
[1]: https://github.com/docopt/docopt.coffee
[2]: https://github.com/substack/minimist
[3]: https://github.com/visionmedia/commander.js