I just find that YAML doesn't improve anything over JSON.

Having recently migrated from cloudformation to terraform on a project the use of HCL is wonderful in comparison and when I'm all ready to commit I just type terraform fmt and everything is aligned properly. Considering it's just as trivial to do this in any JSON prettifier...I don't understand the need for yaml besides pure asthetics which is why you either love it or hate it, because it doesn't help or hurt it just annoys you or it doesn't.