The knobs and levers of our old 1971 Volvo were very well laid out ergonomically. I could easily find and operate any of the controls, by feel, without taking my eyes of the road. The knobs were all large enough for someone wearing winter gloves to easily operate. The knobs and levers typically provide non-visual feedback with clicks or the sound of a fan, or the feel of moving parts.
By comparison, my 1992 GMC Sierra pickup truck has a collection of buttons all grouped together in one small area of the dash. To adjust the heating or cooling temperature, I need to find and then hold down the appropriate button for several seconds, while watching the temperature setting slowly scroll across the small display. While holding that button, I need to look back and forth several times, between the small display and the road. Unlike the old Volvo, there is no feedback in the form of sound or how the controls feel.
When I occasionally find myself having to drive a much newer car or truck, their controls are so complex and confusing, that even the controls on my old 1992 pickup truck seem simple and easy to use by comparison.