Have done this twice before and can say that it is one of those take or leave it deals.
At the end of the day, it comes down to where you would like to sit in the theater and how long you wish to wait to get to said seating. Through the package, you get 'reserved' seating but it is off to the side and not very close. The upside is that there is a special entrance where you will go and not wait as long to get in (upwards to 45 minutes).
The non package route will send you to the main entrance where you will wait longer but the early bird WILL get the very best seating. My wife, MIL & I were fortunate enough to score dead center 6 rows from the front on the clearest, best weather night ever.
Back to the package, you have 3 choices for dining (buffet and sit down) and sufficient seatings to accomodate both shows (weather permitting).
My vote would be to dine a la carte, go for the earlier of the 2 shows (6:30, I believe) and give yourself at least 1 hour at the gate and enjoy.