I'd be curious to see how everyone organizes their source code.

Let's see some screenshots or terminal dumps of your set up.

Here's what I've been doing for the last 5 or 6 years:

I like to organize my code by what it's used for rather than by language.

I've been a freelance developer for about 20 years and inside of those folders are hundreds of projects ranging from Visual Basic 6 from the mid 1990s to more recent projects written in Flask, Rails and Phoenix.