The "Go to" tool bar starts with a / even when you are in a directory that is not root. This does not make much sense. It should either show the full path or nothing at all.
Previous requests for the goto function indicate the root was a common target for goto and therefore is placed on top. Nonetheless, the goto combo is a smart combo and it will do autocompletion based on the entire history of goto commands. Before autocompletion kicks in, the second entry on the goto popdown list is the last directory "goto'd". Then follow ordered by ammount of hits.