I completely agree with the above posters. I find the notion that all members of a party (including small children, kids with special needs or the elderly) should be required to put in their time on the line merely so that the people behind them will believe that they've "earned" their photo with Mickey to be completely absurd, and overly judgmental to boot.
If 4 people are going to take their pic with Mickey ahead of Judgy McLinewaiter, it matters not a whit in terms of actual time to Ms. Judgy if all 4 stand on the line or if one designee does, as long as everyone rejoins the line before their turn is called. 4 people don't develop an ability to pose for a photograph faster due to their time served on a line.
And I see absolutely no point in forcing a 2 year old, or an autistic 12 year old, or an elderly grandparent to stand in a shadeless confined space for 40 minutes or more simply to appeal to some random McLinewaiter's arbitrary sense of line-standing justice.
And I think the pious little group that prevented the bathroom-emergency teenager from riding ToT completely suck. Though I'm sure they felt very proud of themselves for putting the poor kid in his "place" that day.