the new great elementary gtk+ theme has been out a few days ago. it is really sexy, but the new breadcrumbs bother me as well. so i took an old one (from this side i think, cannot remember the author:/) and restyled the prelight one. now it matches the viewswitcher perfectly (imho).
i did look again into elementary folder, and found in the nautilus folder the old styled "arrow" breadcrumbs, (i just ignored it before). they seemed to be the same style as them i edited. anyway, respect goes to danrabbit and the elementary team!