Good question, Letsbgoofy...
unlike at WDW, where there are actually seats to watch fantasmic from, in Anaheim you get to fend for yourself. Think Main Street Parade... and all the antics that go on there as people push and shove for a nice viewing spot. (Particularly five minutes before the parade starts.) Only its worse.
Nearly everyone watching Fantasmic has to sit on the textured cement that makes up the walkways which do double duty as the fantasmic viewing area- and it is a bit uneven in places. Some lucky souls get to sit on the tops of the low brick walls. But for most of us, we are somewhere in a mass of tightly packed bodies... and once the show starts, we are standing on our feet trying to see between the heads to catch a glimpse of the show.
If you are unfortunate to be there on a particularly crowded night, bodies can be packed in tighter than a Tokyo subway train car. And if the evening is very hot its even more fun. On the bright side, if someone has a gas attack and there is no escape and no wind (pardon the pun) to move the offense away, the smoke from the fireworks will ease your suffering.
$47 per person for clean air, breathing room, a delicious desert, coffee and a comfy chair? Its a bargain!!!!
Darian