I left my keys in the ignition the other day. It happens. I looked all over the place for the keys. Finally I said, I wonder if I left them in the car. I did. Never did that before but shit happens.
I do it as well. I am in and out of the car all day. When in a hurry. I sometimes forget to even shut off the car. The fact that I can not get the key out without putting it in to park is a benefit.