How does using MIDI affect me as a musician?
MIDI itself will not directly affect your playing or your performance. Mostly, it does its work unseen.
One useful function that does affect musicians directly is the ability to record your performance and play it back through the organ. Another feature is that MIDI allows that keyboard information to control any sound or intrument that can be sampled. In other words you can use your keyboard to play a cello, trumpet, 32' pipe or a d'jembe. You can also switch between these instruments instantly.