Just calm down, there is nothing to fear. KDE does not want to take your beloved (and sometimes very effective) command line away from you. You can move your files with the desktop, but you can also use the Unix commands you are accustomed to.
KDE provides a very sophisticated command line window called konsole. Choose application starter->System->Terminal to start it. This may be something you want on your panel!
Sometimes, you only want to enter one command on the command line. In these cases, you do not need a full-blown terminal. Just hit Alt-F2 and you get a small command line where you can enter one command. The command line window will disappear afterwards, but it remembers your command. When you pop up this window (which we call "minicli" by the way) and hit the Up-arrow, you can browse through all the commands you have previously entered. Also, you can enter URL's in minicli to open a Konqueror window with the specified URL. A final tip: to display a Unix man page, enter man:command in minicli, where command is the name of a Unix command.