E.g. I work on a huge monorepo at this new company, and Emacs TRAMP was super slow to work with. With help of Claude, I figured out what packages are making it worse, added some optimizations (Magit, Project Find File), hot-loaded caching to some heavyweight operations (e.g. listing all files in project) without making any changes to packages itself, and while listing files I added keybindings to my mini buffer map to quickly just add filters for subproject I'm on. Could have probably done all this earlier as well, but it was definitely going to take much longer as I was never deep into elisp ecosystem.