Well now it can be. WoW Instant Messenger (or WIM for short) brings you the best of the Instant Messenger features out there and packs it into one nice addon. The main thing is just that it separates each conversation into a different window (or tab!) so that you can keep them straight and not miss any messages. You can set these windows to appear whenever a message comes in, or to wait for you to click on the icon, just like an answering machine. They also display the name, level, class, and guild of the person you're whispering with, and there are several buttons on the side, which allow you to do several things, such as add the whisperer as a friend, or find out where in the game he or she is at the moment.
So if WoW is not only a game to you, but also a place to meet up with your friends and just talk for hours, be sure to have this addon to make your social life a little bit easier.