I grew up using the command line in Dos so obviously there are some commands that I feel more at ease using on the command line, it also gives you a greater feeling of control.

I think the command line is being left behind but there are still some commands that require a command prompt.

PING and Tracer can be used through windows but you get an easier non-nonsense list of the information you called. Windows loves giving you list of things to look at which can complicate the results and, at least distract you from what you really want.

Programmers and IT specialist are the ones that would use the command prompt most. People who use other operating systems, such as Linux, may be using the command prompt there so may like a eqivalent way to manipulate windows.

I think if there is a need for a book that it may lie in the Network support arena.