I've been spending a significant amount of time in my "day job" writing documents using Word 2007. Some of the people at the client had not seen the new Office 2007 UI in action so they started asking some questions, which I was more than happy to ask for them.
One of the first questions was, "Were is the ruler?" It wasn't until someone asked that I even noticed it wasn't on/visible. I have always been somewhat of a devotee to the ruler, but with the RibbonUI and the LivePreview features, I was no longer relying on the ruler to get paragraph, tab setting, etc. information. I've tried making the ruler visible again, but ... I've adjusted to the new UI and the ruler seems out of place.
So in the end, I've increased my ownership of one of the most valuable resources on my computer...screen real estate.