jugofpropwash, consider this. When you bend to pick up items from the aisle you have to slow down or stop. That causes an obstruction. When you carry anything like a bag or coat it will both add to your width and slow you down. When you bend over to pick something up you risk being trampled to the floor in the panic to evacuate, especially in smoke.
Throwing stuff out of the door is crazy. You don't know where it will land, you will have to pause, even momentarily to throw the item so you can try to avoid hitting anyone or the slide.
If items have fallen from the overheads into the aisle it is generally quicker to climb over or kick them aside if you can.
The same rule applies on a crashed aircraft as in a burning or bomb threatened building. Your job is to get out as fast and as unencumbered as you can.