What part of "click and highlight and drag things around" includes "drag and drop"? I'm not going to comment on drag-and-drop as being a useful feature (I don't consider it one), but it wasn't mentioned in GP.
Drag and drop's pretty neat I reckon. Pretty nice when things tie into the native APIs in OS X so you can even drag snippets of text between applications. Pretty sure people would have shat their pants when they first saw that working in NextStep - it's nice not to break it.