Depending on the crowds (and time of year) you can WALK IN (no dinner pkg.) and choose:
(Time before posted showtime)
1 hour 15 min. virtually ANY SEAT, any row
1 hour: virtually ANY AREA (if not a specific row) in the Theater
30 min.: Good seats in either SIDE areas (not the center sections)
15 min.: Seats in the FAR SIDE and "over-flow" (top of theater) sections
5 min.: Good luck with that
Remember:
A. This is a GIANTIC show in a GIGANTIC theater. You will be able to fully enjoy it from seats that are nowhere near the "center" or "down-front" in the theater.
B. You CAN get sprayed or splashed by certain water effects if you sit down CLOSE to the water (within 10-12 rows or so)... but, unless its a cold (and/or WINDY) FL night, you should not worry too much about this.
I've seen the WDW Fantasmic! well over 2 dozen times.
I've never done a dinner pkg. and have still seen it from the "front and center" position, to all the way back near the top and off to the side... the show is always, well, FANTASMIC!
And the show at
Disneyland, where it originated, is even BETTER (but that's another post).