Even after flying close to a million miles over the years I still count the number of rows forward and aft of me to the exits every time I get on the plane. I really don't pay attention about how to put on the oxygen mask or how to buckle my seat belt. It always scrares me that there are people out there who may not know how to buckle a seat belt.
I also reach under my seat to make sure there is a floatation device. After that I just go into my "zone" and fall asleep. It makes the flight go much faster.