The castle faces north-south. You will never get a sunrise over the castle. As for Main Street by the time you can get a picture of the sun rising over the buildings it is already too high in the sky to make any impact. I was in the parks at sunrise a few years ago in springtime. The sun actually rose over Tomorrowland IIRC around the area of the train station. Not too dramatic but still cool nonetheless to be in the park so early.