All I ask is that ThunarVFS not suck.
One of the main reasons I don't use GNOME anymore is because GnomeVFS was such a godawful piece of shit for years and years, with nobody seeming particularly concerned about it.
I would be all "Hey, I'll use the GUI to copy these files from one drive to another" and GnomeVFS would be all "Sure thing! I'll have that done sometime after the heat death of the universe!"
Don't even get me started on the SMB performance.