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expert computer user, maybe. I don't know if it's because I'm a UI developer, or just love computers so much that I enjoy learning new and interesting ways of doing things.

I was talking more about expertise gained on a specific UI. If you are a vi expert, you spent a hell of alot of time becoming a vi expert. A fundamental change in vi keybindings will render your thousands of hours gaining expertise on a rediculesly complex interface next to useless, and it doesn't matter if those changes are for better or worse.

Now, there aren't many apps out there that have an interface as obtuse as vi, so that is an extreme example. But you can see it again in office, casual office users were over the moon happy with 2k7 from day 1, expert users have only begun to say that it is a much better UI in the last six months or so. In usability literature, almost every book would refer to office as an example of failure in UI design, it was so poor that doing almost anything other then what they were doing would have made it better. But still, it took about a year for expert users to get on the "Ribbon for complex applications" bandwagon.