Glory
The most satisfied workers are those who understand their contributions are important. Elevators make it possible for patients to be transported quickly to surgery; they enable people with disabilities to work in tall office buildings or attend sporting events in large venues; they allow tired parents to make one trip with the kids and groceries up to their apartment after a long day of work and errands. Make no mistake—those tiny details are hugely important to the people who need them.
See? You're not just providing convenience for people (not that there's anything wrong with that). You're truly helping people who need your service, providing a little shortcut to make someone's day go a little more smoothly. It's not the most celebrated profession, but it certainly makes a huge difference.