You discover something new everyday

This also proves the usefulness of the KDE philosophy of having the advanced feature available even to newbies, rather than hiding it away as the GNOME people do.

I just discovered what "Active Desktop Borders" do. By default KDE has them set to disabled, but when you turn them on there's a whole world of additional functionality there. I'm now running "Active Desktop Borders" with the 'only when moving windows', and I can move a window to a different desktop just by dragging it with the mouse just like you can with the 3D desktop.