As I understand it, the only way to see the Christmas parade and Christmas fireworks shows at WDW before Christmas is to pay for the hard ticket MVMCP.
At Disneyland, the holiday offerings are included with regular park admission. Also I believe that Disneyland offers more holiday offerings and decorations than the MK such as Haunted Mansion Holiday, It's a Small World Holiday, and the Christmas decorations on Storybook Land.