Great parade spot is in the Frontierland area or Liberty Square. Up on the pillory in Liberty Square is great, raises you up a bit.
For Wishes, great spots are the Tomorrowland bridge, also in front of Casey's. Main Street is good, and probably very crowded though. Another good spot, though a bit of the perspective of the fireworks being behind the Castle is lost, is in the Rose Garden, off to the right of the Castle, if you were facing it looking from Main Street.
A good way to miss some of the crowd after Spectro, if in Liberty Square, is to head up into Fantasyland, behind the Castle and on over to the Rose Garden side of the Castle. You miss the whole Hub area crowd.