My fingers remember the primitive command but my mind doesnt. If you ask me for a command and its function, I will not be able to answer some of it. But if I start typing on the keyboard my fingers know what to do.
Yes, it's funny how our brain works. I wouldn't be able to write down passwords that I use daily. Therein lies a pitfall - once you start think about a particular password, it becomes much harder to type it in.
It's like when I was a kid in New York. I could walk anywhere without thinking about it, but if someone asked me for directions I had no idea how to tell him to get where he wanted to go.