> I am looking for useful projects that do something useful for users who can't give a damn what language the project is written in.

the note taking app I use is a fairly popular clojurescript project, first thing that came to mind. https://github.com/logseq/logseq

In general Clojure is pretty popular in particular on the backend. Nubank is I think primarily using Clojure, but Walmart, Atlassian and a bunch of other big companies do to.