Compiled x11-misc/pcmanfm-0.9 (git of 20100707) without gvfs on my system. libfm and pcmanfm seem to be based on glib GIO and not gnome gvfs.
Does removal devices appear on pcmanfm without gvfs installed?
mmmh... checked the web site, pcmanfm *will* depend on gvfs since this is a complete rewrite... closing that bug and opening a new one on lxde-meta.