That is probably because you no longer have to remember that, so you don't. Same thing when I am driving with someone giving out the directions versus trying t

That is probably because you no longer have to remember that, so you don't. Same thing when I am driving with someone giving out the directions versus trying to figure out the way myself. If I was given the directions, I'll probably need them again on the way back. If I figured out the path myself I'll be more likely to find my way back.