In the big world of signalling using emf, morse code is the only way to communicate using pure manual xmit keying. In other words, if all you could do was switch a transmitter on and off, you could communicate to the outside world via morse code. This could be nothing more than two wires across a coil with a battery connected to it. This means if the mic fails on a radio, but you can still key it (either with the PTT switch or by tapping the wires themselves together), you can still get your signal out there. It also means if you can hear a signal on the monitor frequency and someone is keying back to you, you will be able to tell if they heard you or not.

This is why a 5 watt CW morse xmitter on HF frequencies can be heard around the world, and people can converse using it, where voice, teletype, baudot, or any other signalling system would be in the grass and unusable. I can pick out a morse code signal and communicate at 6 Db sinad, where voice communications are practically impossible.

That's one reason to learn morse code, and I think it is a big one.