I've started highlighting constructors like Some and None consistently with type names in difftastic, and the results look so much more readable!
I've been consistently impressed by the Doom Emacs community. I get really high quality bug reports (sometimes patches too!) from both the users and the maintainer :)
Computer hardware has become more powerful, but it's not always obvious how we've used the extra compute.
It's obvious for monitors though. Newer monitors are consistently more pixels, requiring more work per redraw.