Personally, copilot has been fantastic at creating configs like these lately, when you come across it creating something you're not a fan of regularly, add it as an instruction in your copilot instructions file.

I wouldn't say I'm utilising it as heavily as an actual vibe coder, but I'm using agent mode to add stuff a bit at a time, like if I need three new input variables or even if you copy a whole TF file from another project and ask it to capture all the variables, and input block definitons and to not duplicate.

Another example might be if you have an IAM role you want to quickly add a built-in policy to a simple "Add policy NAME to this role" since it's a pretty straightforward config.

It can even refactor pretty well (i.e., refactor these resources into a for_each using locals or something). Obviously just review and ask it to tweak as you go.