What do pilots do when they first get on the plane as a passenger? – For one thing, they always look around to find the nearest emergency exit. Then count the number of seats between them and that exit. It only takes a quick glance.
In the dark, or under water, or if there is smoke, or if upside down, you know beforehand where the exit is. You can blindly count the number of seats by touch to reach that emergency exit row, because you have counted them.
It’s quick and easy to do, every time.