I genuinely do a lot of coding in Kate, the standard KDE editor. It's enough to do a lot of things, has highlighting, and is more than enough when you just need a quick fix.
I am also still using nano when editing stuff in the terminal. Please, don't judge me.
At uni I did a lot of my Java coursework in notepad, then I’d have to take it into a computer lab on a floppy, tar it and upload it to a unix terminal so it could be emailed to the professor. Java syntax with only the command line compiler is not fun.
I used Notepad++ for virtually all coding I did (Python, JS, various Markup Languages, Action Script back in the day, etc) for a couple decades. The only reason I use VSCode now is because I inherited a nightmare of a legacy spaghetti bowl and needed the function tracing to attempt to figure out anything. I still prefer N++ for most small projects.
Gedit was my main text editor for years. I also used it for work. It has all the basic features that you need for coding. For everything else I use the terminal.
I coded several of my early mobile app releases entirely in gedit. Good times.
I sometimes forget how good we have it now. I wrote those apps around 2012 and the DX for the platforms was basically non-existent. Virtually every platform had shit documentation, shit version management, a shit IDE with minimal refactoring features, a shitty debugging experience, and everything felt like it was being botched together by 3 guys in their spare time.
It's incredible now that we have things like hot reloading. You can literally save a change and BAM it's on the screen seconds later. On native platforms no less. Astounding.