My routine is to go to the gate so i know where it is, and then estimate what I can do if there is spare time - a walk back to the shops? These days there is t'Internet with lots on there to keep you amused.... and you can even do some 'work' on it. You can read a book, or do some paperwork if a flight is delayed. Or have a snooze. Planes drive at around 900 kilometres per hour - no-one is really in a hurry.