Epic is still a heavy user of that language at the lower parts of its stack, but there are other, friendlier/more modern languages in pretty widespread use too. Depends on the team & sub-application.

The state of MUMPS has progressed a lot since this article was written, to the point where most MUMPS developers would probably only vaguely recognize this. Even the "MUMPS" they were using back in 2014 or so was really a higher-level dialect + higher-level framework (Chronicles) that was transpiled down to actual MUMPS. It was more like writing ES2015 + JSX or whatever and then actually executing ES3 + DOM operations.

Source: was on a team that was performance sensitive enough that I spent a lot of time in the actual transpiled MUMPS code that did look more like this article.

Having worked at Epic on Mumps code, I am almost certain that article was about Epic.

Does anyone else use mumps?