The reserved seating for guest with the Fantasmic! dinner package is all the way to the side of the seating area. And it isn't limited: if they have 2,000 seats 'reserved', and sell packages for 2,500 people, 500 people have to find their own seats. So you still have to get there 45 min to an hour early. Personally, I would rather get there over an hour early, get a great seat more towards the middle, and grab a hot dog and pretzel for dinner.