I felt similarly when I first saw it, but I saw that there was no java impl, and I'd been looking for a project, so I wrote one. I've been playing with it for more than 6 months and I think it's better than YAML in a number of ways. The syntax is very clear and mostly simple and the noted ability to autoformat is no small thing. I think it aims for a niche, and hits its target pretty well.
I'm the author of the Java KDL library, https://github.com/hkolbeck/kdl4j. I'm currently overwhelmed by other things and unable to do the work to get it up to the 1.0.0 spec. I'm looking for folks willing to help me. DM me on Twitter at the same name if you're interested.