I rely on #emacs describe-* (most of them are accessible via C-h) functions a lot when hacking on my own elisp code. It’s super cool, useful and convenient to just look up how other functions implement Y or solve problem X as every existing part of emacs can be inspected and used as a programming reference and implementation example within a few keystrokes.

I started programming in around 2005/2006, and started using #vim a few weeks after having written my first line of code. So Bram Moolenaars vim has been the biggest consistency in my career so far, and I say that as an Emacs user who still uses vim for plenty of things. Reading about his passing today made me incredibly sad as his work had been a huge positive influence and consistency throughout my career as a developer so far.