Personally I have noticed "File explorer apnea". When I need to navigate to a file or folder very deep into the hierarchy, starting from the root. I know exactly where it is but still need stepping into the hierarchy of folders, clicking on the right folder at each step as fast as possible.

I have almost completely moved away from clicking through folder hierarchies since I learned about Everything [1]. That little program beats the pants off anything Windows has built in for search.

[1] https://www.voidtools.com/

Any other essential Windows tools in 2023?

This one's part of windows, but in case you're not aware of win+v for clipboard history I'd probably put that at number one. (There are also some third-party alternatives with more options).

Aside from that:

PowerToys (I mostly use fancy zones and file locksmith, others are useful too).

Anything for getting recursive folder statistics (I use TreeSize, WinDirStat is also popular).

ClickMonitorDDC if you need to change on-board monitor settings a lot or want to automate it. Sadly seems to have been abandoned.

I use vscode for anything plaintext related (text editing, file/folder diffs, git history). It works decently as a terminal too.

WSL

A nice CAS calculator. wxMaxima is the closest I've found to what I want.

You could use Monitorian for changing screen brightness via ddc.

https://github.com/emoacht/Monitorian