All I can say to this is we've watched Fantasmic 2 times and the first time was AWFUL because we weren't there early enough. This was Oct. of 2003. We showed up about 15 minutes before it started (we were newbie's and didn't know much then

).
We had to stand WAY in the back and couldn't see at all. Our feet were aching and my dd couldn't see at all, so my poor DH put her on his shoulders. It was a horrible experience, but from what we could see, we knew it was a wonderful show.
Well, we went back last Oct. and decided to do the FDP at H & V because we wanted to really be able to see and enjoy it this time. We loved the FDP. The buffet was surprisingly good and going in the "back way" was cool

The seats are to your right when facing the stage, but we sat all the way over and were basically in the middle of the auditorium. We were actually one of the first families to arrive in the reserved section (30 min. prior) and the other sections were completely full when we arrived (it was standing room only for them). We felt like VIP's
My best advice would be to either wait the 90 minutes to 2 hours beforehand OR do the FDP. Even in "non-busy" times, Fantasmic is VERY popular. Oh, to answer your other question - when there is only one showign - the show starts at the time the park is closing (in your case 8pm).
Good luck in your decision.
