You mentioning that note reminds me of my buddy who does handyman work. He fixed a squeaky door for an elderly neighbor last month. A week later he found a thank you card tucked under his coffee tin on the porch, with a couple homemade cookies wrapped up. He said it made him feel like a superhero for a whole day, you know? Just that little bit of "I see you" stuff.
Used to think people left notes like that just to be polite, but hearing @martin.nancy mention his buddy and those homemade cookies kinda made me reconsider. Guess a simple thank you really does go a long way.