Yes, I remember the nice passengers. To me it made all the difference if while disembarking someone would say "Thank you for the service"! That made it worth the effort. Similarly when I was on ground duty. I remember the nice passengers but also the "Gentleman" who couldn't be upgraded and spat me in the face for not upgrading him. Then he picked up his little daughter who must have been all but 5 years old and told her, "See darling, this is what you'll end up doing if you don't do well in school", all this whilst I wiped his spit off my face and smiled through gritted teeth while handing him his boarding card. I would have happily throttled the A'hole!
When I fly as a passenger I always make sure I thank the crew because I remember the difference it made to me!