I'm referring to UI interfaces that allow you to do structural editing only and usually only store the structural shape of the program (e.g. no whitespace or indentation). I think at this point nobody uses them for programming, it's pretty frustrating to use because it doesn't allow you to do edits that break the semantic text structure too much.

I guess the most used one is styles editor in chrome dev tools and that one is only really useful for small tweaks, even just adding new properties is already pretty frustrating experience.

[edit] otherwise I agree that structural editing a-la IDE shortcuts is useful, I use that a lot.

Some very bright Jetbrains folks were able to solve most of those issues. Check out their MPS IDE [1], its structured/projectional editing experience is in a class of its own.

[1] https://www.youtube.com/watch?v=uvCc0DFxG1s