As above, there are no buses from DS direct to the parks at any time. You'd have to take a bus from DS to a resort and travel to the parks from that resort. Buses from DS to resorts don't start very early in the morning since DS doesn't open until 10 AM most of the time, so it's definitely not a way to make rope drop. And unfortunately there are no sidewalks that would allow you to walk safely from WBC to a Disney resort. So from WBC, for transportation to the parks your options are rental car, WBC shuttle, or rideshare/taxi. Sorry.