You can also rent a boat to drive you around the Seven Seas Lagoon and then park for a great view of the show, true, you might not be able to hear it as well, but the view, minus the crowds and pavement is a nice treat.
Pontoons cost $120 and many people share them (place a post saying the date you have the boat reserved for) I did this and already have 5 adults to share the cruise with.
We plan to experience both park side and boat side while there.
Last time we ate at the california grille in the Contemporary- music is piped in so that guest can here, they are beautiful to watch. There is a bar area if I remember correctly you could go up and sit and watch them from there. There are quite a few different options for how and where to watch this show.
IllumiNations in Epcot is different- boats are VERY hard to come by- you will see a link to sharing boats at the top of the theme parks thread. Look for the dates you are going, or post what you are hoping for. Generally 90 days out is the rule for booking these.
And of course there is Fantasmic as MGM- a fabulous show!! Every seat is a good seat, as long as you are not down front- its HOT!!!
I hope I helped you out.
