I recently found out that Mitchell Hashimoto has a setup like this, which blew apart my belief that you need modern tooling to be productive. Do you not find that you fatigue more quickly as a result of having to actively recall everything though? I can't understand how doing things like this would actually result in better code.

Not GP, but I can add my two cents.

The trick is to avoid idle browsing of the code. Be intentional about what you need to do.

I use tools like grep/ripgrep to get a more focused of the code. Then with the line number, I can jump directly to where I need to be. Same with tools like linters and compilers.

In the same file, I often use search instead of line/character movement. You search for a symbols and you just cycle through their location.

I don't think it leads to a better code. But badly organized code will make this harder, so you tend to think about organization.

I'm not sure that's true. I've heard him talk in several interviews about using AI tools, including in his editor. Definitely not a minimalist setup.