Plenty of people still use Emacs.

I picked it up several months ago after using Jetbrains IDE's for quite a long time, and honestly haven't felt the need for any of what Jetbrains brought to the table.

Mostly thanks to LSP.

If you're not a Java developer, Emacs is perfectly fine as a configurable extensible editor. With the additional caveat that its lack of multithreading can get in the way sometimes.