We go in December and there is usually only one show a night.
We 've done it three different ways, never with the dinner package:
2000, we ended up getting there late, maybe 10 minutes before the start of the show. Sign said SRO, but there were lots of seats up behind the dinner package section on the far right that we were directed to. Nice view, although not synched as well as being front and center. This was back when they had the two guys warming up the audience in a pre-show with the songs and doing the wave. That was gone by our next trip.
2002, we decided we loved the show enough to devote some waiting time. The show was at 6:00, so we arrived at 4:00 at the rope area and were let in within just a few minutes. We got the railing bench in the center and unpacked our counter service meal from our bag. We did buy the big souvenier mug filled with soda at the theater stand. After that, we then took turns wandering, looking at the Fantasmic goody cart, chatting with CMs, and watching the stadium fill up. It was COLD that night and folks were shivering and buying whatever the vendors had, mainly beach towels, to try to keep warm.
Here was the payoff: (note this is just the finale, but you can get a sense of our seats from it)
Fantasmic Finale 2002
2004, Having done the whole long wait, great seat, wonderful video, we decided to not devote 2 hours before the show and arrived about 40 minutes before show time. Middle sections were full, side sections about half full. We were two sections over from the far right and about half way up. The view is still good and the show will be great no matter where you sit, provided you get a seat. We didn't worry about eating this time, since we had scheduled an after parade ice cream treat at Sci-Fi late that afternoon. Might be another option for folks wondering if they should put down the big bucks for a far right, albeit reserved, seat.