I'm on a plane about four times per year but always short haul... You board, stuff your carry on luggage into am overhead compartment, sit down in your designated seat, fasten your seat belt, politely listen as the crew tells you what to do in an emergency...and then the plane takes off. Once up in the air, the crew will start selling snacks and drinks, you can go to the toilet, read, listen to music, sleep...
And before you know it there will an announcement that tells passengers to please prepare for landing (seats in an upright position, seat belts back on, no more walking around etc.) and then the plane begins its descent and lands. Everyone grabs their stuff from the overhead compartments, and leaves, thanking the crew on the way out.
Unless there's turbulence it's like being on a very large bus really.