We have an automatic soap dispenser at the restaurant, and it comes in very handy when we're in a hurry. We went with a commercial wall soap dispenser mounted over a hand sink. If I've handled something greasy or raw, I can just put my hand near the sensor and get the soap I need right away. When we had regular liquid soap dispensers, they would often fall off the sink and onto the ground.
Our particular kitchen soap dispenser uses pre-filled replacement bags, because we don't always have time to refill it with liquid soap from a large bottle.