Not only that, but buttons usually had hotkeys (underlined letters) that made the OS very easy to use without a mouse. Until we moved away from Windows 2000, colleagues used to be amazed at how fast I navigated. With the precedent set by XP, many UI's became HTML-like, and instead of buttons, we'd have links. Mouseless navigation became impossible with more and more apps. And now, I've lost that habit.

I don't use Windows these days, but Linux GUI programs are not as well-designed as the old Windows programs, so I find myself reaching for the mouse every now and then.