The fact that you've never done and can't imagine anything complicated enough to need more than a simple hand-written data-only config file doesn't mean other people don't do that all the time. It's simply a failure of your imagination.
What I can't understand is what you were getting at about "punching down". When you say things like "I would be strongly tempted to murder an engineer", that sounds like punching down to me. And why you were complaining nobody gave any examples, by saying "no specific GOOD examples of configuration-as-code have been brought up". Don't my examples count, or do you consider them bad?
So what was bad about my examples (or did you not read them or follow any of the link that you asked for)? Pantomime had many procedurally generated config files, using the JSON templating engine I described, one for every plug-in object (and everything was a plug-in so there were a lot of them), as well as some for the Unity project and the build deployment configuration itself. It also used dynamically generated JSON for many other purposes, but that doesn't cancel out its extensive use of JSON for config files.
I don't use configs in this way, or if I did, I would not be inclined to call them configs. I can certainly appreciate the problem of processing of JSON objects in many different contexts. I was more referring to a UX concept of providing a configuration interface—short of something like emacs that gives full functionality, simpler and easily debuggable is emphatically better.