I am currently working for an administrator who does this type of thing. Just a few words of appreciation, when she doesn't have to, makes a huge difference in how I feel about work. I am coming from an administrator who wouldn't have said a single nice thing to anyone about me in spite of doing the same jobs and extras around the workplace. It has drastically improved my (and my families) way of life.
Andrea- The best reminders of why we do our jobs comes from the simple things. Your student dropping off a snack was so genuine and such a great reminder! Makes me want to order some bags of popcorn to drop off on desk!