As time as gone by, I can't speak for others but I find myself primarily using toolbars, along with much more use of the right-click menus, as almost everything in the Ribbon can be found there also.
The biggest positive about the Ribbon is the contextual tabs.
The biggest negative is it still feels like it takes more time to find commands, not to mention the actual switching of the tabs is dreadfully slow, even on a powerful machine. It took several releases to get the CUI interface really usable, so I anticipate the Ribbon will continue to get better.
For programs that I use less, like Word, Excel, etc., the Ribbon is a real killer because I can never find what I need.