Quoted to second this. I do not care about the lines at the QS restaurants. Standing in line for these has never impacted my decision on bringing outside food in. The prices of the food at the QS restaurants has without question. I've stayed offsite before and decided to take a late afternoon snack until leaving the park, to grab some food off-site as well, and once again, it was price driving that, not wait time.
I can't imagine the thought process that would make me say:
"I don't want to stand in that line for food, it's 30 minutes long! I'll walk to the front of the park, take the monorail, take the tram to my car, drive off premises, and then get food. That'll be quicker for sure!"