Well I don't know about you, but I use my eyes to figure out where to put my fingers before I start typing, even though I can then carry on with my eyes closed ;) - backlit keyboards are great for this. Particularly handy as it starts to become dark, or if you're working in a shaded area.

(Positioning your hands by sight may not be that uncommon among people who learned to type before the F and J markers became commonplace on computers. I was in my late teens before I first encountered them, and I had to have their purpose explained to me.)