Originally Posted by
Velocipediste
What I expected: The seat belt sign would ding off, aisle passengers would jump up and retrieve their bags, and wait in the aisle.
"Jumping up at the ding" is the flip side of the gate lice phenomenon. No point in getting up until the jet bridge is connected and the door is open, at the very least. The exception to this is if you're in the first row and/or your bags are behind you.