As far as I know, the dinner package only has a section of seats off to the far right, so yes, there are good seats available without the dinner package. You may have to get there earlier than you'd like (1-2hrs before) but you can get them. The dinner package just secures you a seat, not the best ones. Having said that, there are no bad seats for Fantasmic.
BTW, you might not want to sit in the first few rows as the spray off the water screens can leave you a little wet!