You won't see a queue if you arrive an hour before. They open up the statdium so guests can sit and wait (if you go during peak season like July, you might see guests lining up before the stadium is open so they can get good seats but that's not the norm off season and that would be about 1 1/2 - 2 hours before the show). If you can head over to the show by 7:30p, you should be fine.
I've done Fantasmic with the package many times for fear of a line that I kept hearing about. Finally, we decided to eat where we wanted and not do the package and it was great. We entered at one hour before and had great seats in the middle, half way back. The times we've done it without the package were end of August, end of Sept and end of Oct. Got great seats every time.
Oh and I've done the package also in Aug, Sept, Oct, Nov and Dec and almost every time, when I was seated in the package section there were still many many good seats in the middle section still available. Once we just walked past the package seats and sat where we wanted.
The package is great during busy times of the year if you want to be guaranteed a seat, but it isn't necessary off season.