I had a bad experience with this back in '04.
We (me, DW, DD, and DS) were standing in line for Philharmagic. A lady was in front of us, who appeared to be by herself. A man approached her, and coldly "excused himself" into the line with her, talking to her. Seems he was her DH. I didn't have too much problem with him. But, all of a sudden, the rest of their family showed up, and expected to be at the same spot in line. In total, there were 7 people in their family.
a GROUP can hold a spot for a single person, and I won't have much problem with it. But when a single person holds a spot for an entire group???
That's when WDW should be glad they don't sell chainsaws. heeheehee