I used Oh My Zsh for years, but there were literally 3-4 features I relied on: autocompletion, git plugin, history search, and one theme.

For some reason it was slow to load which I found annoying, so I used Claude Code to optimize it. In the end I ended up removing Oh My ZSH entirely, now I have a single .zshrc file that contains everything, and it became much faster.

Similarly I moved from Packer to Lazy.nvim and updated a number of libraries, and from iTerm to Ghostty, Claude Code essentially converted my configs in a matter of minutes