Well it's not exactly caffeine, but it is a hidden gem of a module. Coffee is a contributed module that allows users to navigate through Drupal admin faster.
Coffee allows the admin to work heavily with keyboard shortcuts (Alt+D or Alt+k) and reduces both the need to navigate using a mouse, and time searching for a specific link or function on the admin toolbar.
Once the popup prompts, the user only has to enter the first few characters of what they're looking for.
For example, if I wanted to add a new article on the site I would do the following:
The last benefit of this module is that drupal developers can leverage it using hook_coffee_commands() to add custom functionalities.