I am not "just back", but last year twice did the Fantasmic Dinner Package on Oct 31 and Dec 6, and both times the theatre was less than 70% full (three complete sections empty). I don't regret doing the package as Hollywood & Vine is a good buffet and the package only costs what you would pay anyway, but it certainly wasn't necessary. Some guidebooks tell you Fantasmic always fills and you have to be in line 90 minutes early, but it just isn't true during slower times.
An advantage of the dinner package seating is that you can sit wherever you want in that section (front, middle or back) without being "herded". Although it's off to one side the view of the show is just as good as any other section.