If you are knocked prone, your turn is not over. You can still take actions, reactions, and bonus actions. And standing up takes ½ your movement. Let us stand up, not WASTE an entire turn.
Yes, the prone thing was so confusing for me. I slipped on my own ice and my turn just ended with no actions and no movement. I thought this was a bug. It never even OCCURRED to me that this could be intentional.
That makes no sense. People can move and even FIGHT from a prone position.