The fact that no devices are appearing in the Bluetooth pane is an indication you have no Bluetooth connections and can safely turn Bluetooth off.
Note that if you make use of AirDrop to send files between your Mac and another Mac or an iOS device, you'll need to have Bluetooth turned on even if you don't use any wireless input devices.
Good point!
"All you've got to do is own up to your ignorance honestly, and you'll find people who are eager to fill your head with information" --Walt Disney
