Well the important thing is, you had fun doing it, I guess.
Back in the day, people would just say: ''Hey Man. You left your lights on." And you'ld say "oh, wow. Thanks Man", as you reached in the open window and slapped the switch to off.
Nowdays, because so many new trucks have a ''headlights-on'' audio indicator, no one bothers you, they just think the lights will automatically go out after 90 seconds, and it's no concern of theirs anyway.
After you've left your lights on and drained your battery once or twice, you get a conditioned reflex to kill the lights on shutdown.
Reminds me, I have to get a new battery for the GMC today.