Scripting is a great tool for performing a variety of tasks. A script can be as simple as an automated common task or as complex as an entire new feature. You can create your own scripts, and you can run scripts that other people have created. For more information on scripting, see the Scripting Guide, scripting requirements, and other developer resources at http://www.adobe.com/devnet/indesign/documentation.html.
The Scripting Guide contains an introduction to scripting and tutorials. You can also find a number of useful scripts that you can run, such as a script that draws guides around the selected object. Some of these scripts appear by default in the Scripts panel.