I think most everyone is on go or python for BE work.
Just really frontend focused apps or heavy react shops are doing js on the backend.
EDIT: I think “use server” is a nextjs thing FWIW
https://nextjs.org/docs/app/building-your-application/render...
Personally,I don’t think php or js are the right tools to build a backend for a business.
Neither are particularly friendly towards growing teams for many reasons, but the lack of strong typing is a big one.
You want your backend to have minimal complexity, that’s why go has been so popular lately
Also, to your second point, some of the largest, most critical, and most at-risk businesses on the planet (namely banks) run on COBOL, but I wouldn’t exactly describe cobol as a language that lends itself well to large orgs, it’s just entrenched. same as php and dozens of other technologies.
There is something about the 'use server' declaration that just bothers me. I dunno.