Re: I like the ribbon
The problem with the Ribbon is that it takes up far too much screen real estate, so it doesn't efficiently replace the old myriad toolbars you used to see many users cluttering their workspace with.
Sure, it's quick to access things (in theory), but nowhere near as quick as a keyboard shortcut. So a better interface would probably be a traditional menu style (for more 'advanced' users - ie: those who actually learn and use their keyboard shortcuts) to maximise screen space, with the option (perhaps as the 'default setting' for those not adventurous enough to go into prefs and turn it off!) of the ribbon to give that 'one-click' style button functionality back to users of the old interface.
In actuality the ribbon is a great +idea+ for a UI, but would be greatly improved by redesigning it more akin to the mega-dropdown menu systems seen extensively on large websites nowadays. Sadly, in reality, it's a cluttered mess of information with the look of something to which no thought has been given to spacing or layout resulting in visual overload. Take a look at the way buttons are laid out in OS X Mail (not from a fanboi perspective, just as a case in point for UI design) and compare it to an Outlook Ribbon style interface -
see how much quicker it is to perform the most important basic tasks when you can find what you use most in a split second rather than trying to scan back n forth across that craziness until your stumbles upon the option you're looking for?
Additional functionality beyond those main buttons remains under a well arranged menu system and keyboard shortcuts are mnemonic to aid speed of memorising.
For many users (who don't bother to learn shortcuts) an interface somewhere between the two would be the ideal solution. Main functions as easily accessible buttons with further functions under a well arranged and presented 'mega-drop down' style menu (see link for a handful of examples of good UI design for this...)
With most of these designs the most important element is the spacing. Space! Space! Space! The ribbon as it stands has none of it and that makes it harder to use for a lot of people than a nice clean evenly-arranged interface like a menu. More attention to this kind of detail makes all the difference. After all, design is more about what you leave out (and the space between the elements)!