I was asking a similar question for numerous use cases (e.g. code snippets, book reviews, notes). Gists are so broadly useful, but relatively few developers actually use them. Personally, I found that incorporating gists into my daily workflow just wasn’t very convenient, and so I ended up creating a VS Code extension that allowed me to create, edit, and comment on gists within the editor: https://aka.ms/gistpad.

I’m not sure if ease-of-use is a reason for others to not use gists more frequently, but I’ve definitely become a bit of a gists “advocate”, after appreciating just how useful/flexible it is as a “developer cloud storage” solution.