Me too! With the exception of Outlook, I stick with Office 2003. I'm so much faster and more productive with it.
The problem with the ribbon is I find myself constantly having to click back and forth between different tabs. It's annoying, and takes twice as many clicks to get things done. Microsoft lost sight of the purpose of a toolbar: to make commonly used functions ONE click away.
When the rest of the industry followed suit and emulated them, the result was a tragic loss of precious vertical pixel space for the content I actually cared about: whatever I was working on.
I also miss the elegant discoverability of classic menu bars. I loved being able to open a program and quickly become familiar with what tools are available.
They did a great job surfacing keyboard shortcuts. Hints were right there beside the menu items, subtly advertised every time you clicked them. You naturally learned the ones you used most. I worked alongside a younger guy for a few months who was blown away by how quickly I navigated around my PC and got work done, for many sequences using like 90% keyboard and 10% mouse.