When we were there recently, we were just coming off the ride at Norway and walked straight ahead to the "fence". There were families already along it. We asked the family in front of us if it was a good place and they said they always stand there. We had a great talk with them (they were from Britain) and when Illuminations began (and all the way through) it looked like it was just for us. In the past, we have watched near America/Italy where there's a little aread that juts out a little into the water and that was great too.
My only advice--don't stand near trees! They will block your view of the fireworks more than you think.