I rarely gave them out for an employee helping me… I like to think of myself as a low-demand customer with few needs.

I really liked to give them out when I observed an employee going above and beyond with another customer. Whether it was a problematic/angry guest and the agent kept their cool… or I noticed them going out of their way to help an unaccompanied minor, large group, or older person. Those are the times when I think someone who has an (often) thankless job might appreciate that someone saw them and thought they did a good job.