Jokes aside: of course only time and use will tell, but the user interface shown in the demo looks pretty intuitive to me in perspective, even for non-geeks. I also think it’s the “wave” concept itself that makes complex interaction much easier to perform: besides a seemingly straightforward UI, what really blew me away about Google Wave is the way its designers managed to integrate so many different functionalities within a single shared “object”.

That said, I absolutely agree that the early adopters of Wave when it finally launches will be Internet power users and professionals like you and me: just think about what features like concurrent editing/discussion and integrated versioning could do for your productivity! And both of us know all too well how frustrating it can be to have to use non-integrated, poor usability tools in your everyday work…