Nope. Disney is pitching on-line check-in as a way to reduce the amount of time it takes you to get your room keys when you arrive at the resort. When you arrive at the resort, there is a special desk for those that did on-line check-in. There they will have a packet that contains your room keys, dining plan information (if on one of the plans) and the rest of the information they normally give you at check-in.