If you are a system administrator, then you probably find yourself using the Windows Command Prompt more often than most people. When running this window, old-school admins get into a DOS or Linux mindset and just don't like to use the mouse. Heck, one of the Microsoft interview questions for admins is "How do you fix a problem on a computer if the GUI is busted?".
For those of you who feel your workflow is disrupted by taking your hand off the keyboard to use the mouse, then I have good news: you can change the Command Prompt to scroll mode by using a quick keyboard shortcut. Read more at OCModshop.