Uninstalling gnome-volume-manager seems really extreme... Simply turning off GVM's automounting of hot-plugged and inserted removable media would be simpler.
From the Gnome Panel, click System->Preferences->Removable Drives and Media and then uncheck the first two boxes on the storage tab. This will turn off automounting for everything not defined in /etc/fstab, and you can turn it back on if desired as easily.
If you just wanted to disable automounting of certain devices you could give them their own line in /etc/fstab, making sure that the fourth field of their line include noauto so they are never automounted.
Run Nautilus and open Edit => Preferences > Media.
Turn off "Browse media when inserted".