It helps visitors see where they've been. But do you notice what else it's doing? It's creating long-tail keyphrases of sorts. If you look on our imaginary keyword list, you'll see that [women's designer black pumps] is another viable keyphrase.
As customers click through the navigation, they are following a trail of keywords. The Googlebot can follow that same trail.
So is it true that G! builds up kwd matching based on all the possible combinations you could have all the words?
So with that example does it also see it as 'black designer shoes' or 'designer black womens pumps' etc..