I used to fly Newquay to Gatwick as a passenger regularly and it was embarassing how many times the CC had to ask people to sit down after we pulled up on stand, they give fairly clear instructions each time and yet as soon as one is up, most passengers are out of their seats and in the way.
Obviously you haven't experience of some operators outside the "first world"... Passengers are up and on their way before we even exit the runway!