The walk to and from the MK is super easy for anyone of normal fitness. We always go in summer and the walk is fine. Especially before rope drop, it is very pleasant. We never use the monorail for CR-MK and reverse unless it is a just for fun trip. We do like the monorail for going to the other resorts for meals and Epcot, so that is where this change is going to hurt us in the mornings.