Computers have gone long way from primitive number crunching machines to advanced entertainment systems and serious business machines. Technology advancement made it possible to implement various graphical user interfaces with one and only aspect in mind - end user convenience.
Modern operating systems have all it takes to operate the computer fast. Common user interfaces allow for almost intuitive understanding which in turn means less time spent on learning how to operate the machine and more time spent on actual usage of computer power. However, the rich functionality of Windows has to be hidden sometimes in order leave reasonable number of choices for end user in each given situation. This way, novice users learn interface faster, but advanced users are deprived of powerful features that may further speed up the computer operation.