About 3 months ago I got my feet wet and fiddled around with it for a bit. Eventually I used it to deploy(using deno deploy) a small script which would forward calls to an unofficial API of some App. It turned out chrome would not let me set a Cookie header (which the API required) due to some security policy in my axios calls so my script would proxy the request and inject it when calling the API.
I was pretty amazed by how easy the whole process was. I can see myself using it more often for side projects and even recommending it at work (If I get the enterprise java crowd to try something new).