Comment 3 for bug 891197

Yes. Even if you select "Do nothing" in the system settings you always get a copy of Nautilus opening when removable media is inserted. It may not be obvious if you already have Nautilus open because Gnome doesn't bring the window to focus but it does change the current working directory.

1) Select "Do nothing" in System Settings
2) Make sure there are no running copies of Nautilus and then insert a USB thumb drive
3) Observe the copy of Nautilus that launches that shouldn't have