This question depends entirely upon what type of work I'm performing on a PC. During the day I'm a Net Admin and I'm constantly using the command line to perform tasks. Telnet, FTP, PING, TRACERT, NETSTAT, NET VIEW, NET USE, NSLOOKUP, IPCONFIG are but a few of the utilities that are commonly used by Network Engineers and Admins. Batch files are also used quite often from the command line.

However when I'm at the house I rarely use the command line because I'm just surfing the net, emailing people, and writing documents. There's no need for the command line for that type of work.

I would also like to add that using the DOS Shell is somewhat painful after using BASH on Unix or Linux. Having to navigate long paths in a DOS shell can be torture. BASH is always so simple, just type the first few letters of the directory name and hit the tab key and the auto fill-in guesses the directory name for you.