I use the following aliases in my ~/.zshrc file:

  alias workgit="git config user.name 'full name' && git config user.email '[email protected]'"
  alias persgit="git config user.name 'full name' && git config user.email '[email protected]'"

I prefer this because there are some overlapping directories in my filesystem and don't want to automatically use another git identity just based on file paths. Works well enough for my usecase.