Using the west side of Main Street is problematic since you have to force the crowd through the seating area for Refreshment Corner. The door on that side isn't all that wide either. The east side cannot be used as the parade would be parked on that side of the street.
It is really a terrible option to use, and should only be used as a last resort. It just turns out that the summer of Light Magic they were just that desperate to use it every day. That was just an exceptionally bad summer.