I just had a look at the results of this interesting usability analysis of WordPress.
While I do not necessarily agree with all of it, it is a very good analysis, and most of it makes sense. The biggest thing I liked in it was the concept of “not getting noticed”. As much as I love slick new UI models, and lots of graphics and animation, in reality the best software in the world is software you do not even think about. As a user, I should be focusing on what I am trying to do, not how I am going to make the software do it. Especially for any activity which requires any level of focus, having to constantly context switch from thinking about your work to thinking about whether the software will let you do it is extremely invasive.
I had not really thought before about the design of WordPress (hey, I started using it because it is free!), but overall it seems pretty good. Goodness knows, if it had done things to annoy me, I would have whined about it on my blog somewhere!