The Go To Folder command is the most useful features in the OS X Finder. If you want to lock down a Mac a bit more than usual, you can disable the Go To Folder menu option and keyboard shortcut using a defaults write command:
defaults write com.apple.finder ProhibitGoToFolder -bool true
To make the command take effect, you need to restart the Finder.
killall Finder
Revert to the default setting:
defaults write com.apple.finder ProhibitGoToFolder -bool false
Restart Finder