Alt key shortcuts anymore?

Do standard users use Alt key shortcuts for controls such as buttons anymore?

eg. an OK button could have a shortcut of Alt-K which would be the same as pressing it.

Any control on a form or window could have a shortcut key. In the old days of VB6 you would simply put a & before the letter you wanted to be the shortcut key in the Text field for the control, and it would underline that letter so the user would know which letter is the Alt shortcut key.

But does anyone actually use these kind of keyboard shortcuts anymore? Aren't they just a hangover from pre-mouse days?

Should I bother to support Alt shortcut keys when designing GUI for a modern app?