Not everyone knows to click the logo at the top or in the upper left corner of a page to get to the home page.
In a recent study, some people were confused by the lack of an explicit Home link in the navigation bar. Whether the nav bar is horizontal or vertical, it’s helpful to have Home as the first link. Even though the Web has been around for so long, this is still necessary.
I tell my clients that it’s always interesting, and sometimes humbling, to watch real users work with their products. Little problems like this are exactly why we have to continue doing usability studies.