In XFCE, Thunar has DEVICES in a shortcut pane making it easy to mount and unmount all partitions.
Thunar in JWM isn't setup as fluidly. Even with the volman package, it isn't easy to see how to make partitions visible.
PCmanfm is similar.
XFE mounts and unmounts easily with a right-click menu option but only after the partition is first mounted with another utility. Before then you won't see the partition in /mnt.
Is there a trick to make partitions visible in JWM alt-file managers to replace the need for pmount for basic mounting?