Drush is a shell and command line interface for drupal where in you can do 90% of the routine tasks quicker; whether you are maintaining or developing a site. Drush is such an indispensable tool that you can really break down your developer experience in two ages: BD (before Drush) and AD (After Drush). If you were lured by a module in BD age, the drill was something like:
- Find the module project page.
- Choose the correct module version number.
- Download or checkout (CVS) the correct module version.
- Place the module directory into your sites/all/modules (or wherever).
- Locate the module amidst the long list at admin/build/modules page.
- Choose the module and install it.
This experience often made me feel like a click zombie and my development environment and methodologies as a den of time suckage. Really there are more sadistic drills in the