My opinion from Thanksgiving Week...
Fantasmic- Waste-no reserved seating. Esp with tiering, skip it.
MSEP-loved it. We got to the viewing area about 8:40pm for a 9pm parade and sat right on the rope. Great pictures with the castle, loved it so much we booked it again for Thanksgiving day...no problem with availability for the 9pm show...it was a little more crowded, but not bad. However if you stay for Wishes prepare to be overrun by the masses once the parade ended.
Wishes-after the MSEP we went to the rose garden for Wishes. No problem maneuvering over there. Only complaint was that the garden grass where they expect you to sit was soaked. People near us said it is often wet, and suggested bring a blanket. Great view for tink's flight and nice for Wishes. Did not repeat, but enjoyed it.
Hope that helps!