I've never seen Fantasmic. The idea of waiting with a 3 year old and a 1 year old does not appeal to me at this point.
As always, Declan is adorable!!
It is an awesome show, although some little kids are scared by the fire and the snake, and some of it may be a little intense. The good guys triumph in the end, though, and the big white boat comes out with a ton of Disney characters waving and walking around on the deck.
Whenever your kids are older and you do see it, you'll want to get there early enough to get near the middle, because on the extreme sides you can't see the water screens well enough to know what they are. The stadium is huge. It holds thousands of people, but it fills up quickly on a regular basis.