Of all desktop environments, KDE, by far is the most simple and intuitive. It has an resemblance to Windows. However, it is also fairly ugly and inefficient. However, other than X, which I once used with twm, it is about the only desktop environment that I have used. I plan to try out GNOME and Xfce, which I have seen running once in a Xubuntu distribution, fairly soon.
This brings me to another point. I have begun a new article for the blog called Desktop Environments. Later will be reviews of other environments, including Xfce and GNOME. I will probably begin with Xfce, but I don't know for sure. I will also go into depth about particular packages and features of each of the next environments.