Some time back there was an article about the use of floppies in the Norwegian health service. The reason for it was that some doctors stuck to their DOS based patient journals, as they were fully keyboard operated. Thus they were able to operate them by memorizing the inputs, and could bring up various info without taking their focus of the patient.

And i have observed similar in stores that used DOS based POS terminals, where the operator could add your latest purchase and bring up warranty history with barely a glance at the screen.

And in a more modern sense, i see people getting all giddy about the Android based Blackberry phones because now they have an actual keyboard to use. Meaning that they can hammer out a text or similar on tactile alone.