I am one of a handful that use Emacs at work, and often people are surprised at what I can do that they can't do with whatever they are doing. For example, I have all my Jira tickets in a org file and can update in bulk, create, and assign tickets all from a simple file in a few key strokes.

I am responsible for writing c++, go, python, C#. On top of that I have syntax hi lighting for all the major formats such as yaml, toml, json, but even have lesser known ones as hcl.

I mostly live in the terminal (vterm) within Emacs that allows me full control over things. For example, I have custom lisp functions that can extract a json blob that was just displayed in a log file and open it in a new buffer and have it formatted ready for me to inspect.

You asked bout work-flows, while emacs can do a lot of things it is not yet responsible for compiling code and many common system tools. In such used with Nix I can produce any dev environment on the fly.

Being sa singleton is not a problem mostly because once you get past the voodoo that other systems use its all the same stuff under the hood, and with Emacs you just so happen to have more control of those systems when something goes wrong.