Stars n Cars in August will be on at 5.30 (I think, it was that time when I went a couple of weeks ago).
Following some tips from people on here, we got a position behind the stage near Disney Playhouse, and managed to get a lot of good photos and character autographs (including Cruella, who was really hamming it up with the crowd). Stitch and Sulley pretended to have a fight at one point - I would suggest getting in place at least 20 mins before, and take up a position in the middle of a rope - I found that the characters tended to miss people out stood near to the lamposts the ropes were tied to.
Sleeping Beauty - has to be the Princess Meal at Auberge de Cendrillon if you can afford it!
HSM we watched whilst queing for Cinemagique - it was in the shade (it was darn hot when we were there) and you actually got a half decent view (we were late getting to HSM and the crowds had already started building up so we couldn't see too much).
Fantillusion we watched 2 nights running in town square - much less busy than up near the Plaza, and you can leave it to 20-30 mins before taking up position, then wander a bit up Main St to catch the fireworks. We were late getting into position one night, and the area round the plaza was packed out (people were even clibing over fences to stand on the higher flower beds to get a view), and you could hardly move down Main St. So we took the 'secret' passageway at the back of the Liberty Arcade to Town Square, where there was plenty of space - we were right at the front. We didn't see any 'baddie' stop in Town Square though - I believe a dragon comes out of one of the floats at a stop (or at least it used to - does it still, and if so, where does this happen?). And by being in Town Square, you can get a quick exit from the parks.