Mine fingers tend to rest either on them or just above them.
I can touch-type now though, so that's not a problem really.
It most definitely helped me to learn to start from the home-row (or whatever you call them) when I was learning to type in school, since before then I could only go 1 key at a time, look, find, point and press.
The only difficulty is that, like tails, if my fingers find themselves in a different place for whatever reason, all my typing gets shifted over by a key, and it ends up rubbish.
Also, despite being able to touch-type and not have to look at the keyboard, or even the screen, I find that I make a lot more mistakes when the room is dark and the lights are off.
That would make sense if I was looking at the keyboard and couldn't see the keys, but seeing as how I'm not looking at them, I don't get how not being able to see them properly would affect me.
Unless I use my peripheral vision a lot.