The package is if you want to see the show but don't want to wait in the regular line. You eat at one of 3 restaurants and then they give you a voucher to enter the show from a special package entrance up to 30 minutes before the show.
The package seats are to the right of the stage only.
It's worth if you go at a busy time of year. It doesn't cost any extra to do the package except to pay for your meal. It's H&V, MM and Brown Derby that participate.
We always do the package because we have little ones and my DH doesn't like waiting too long in a line or even in his seat!
You'd call and ask for dinner (at whichever restaurant of the 3 you chose) with the Fantasmic package and they'll give you a list of times. They will ask for a CC to hold the ADR in case of a no show. They give you up to 48 hours to cancel.
HOpe this helps.