I own a business that does computer consulting and I've found that Wordpress is easier to use, easier to administer and easier to train. I also agree that Joomla! does a lot of other things, but I've found it difficult to use, difficult to set up and a little more buggy than Wordpress, so I completely agree with rallymatte's evaluation

We rolled out IM / Pidgin / Trillian to the entire company and found that productivity soared! Instead of having to call people for an answer, you could IM them. Translated into far fewer open calls, lower call time, higher customer satisfaction, less second tier and third tier support calls. If that's not good - don't know what would be.