My goodness. People, you really need to teach your kids to wait in line. My three kids (now 16, 12 and 10) have been going to WDW since they were infants and even in 1995 on NYE (pre-fastpass), my then 3 year old son was good enough to make it through 1-2 hour lines for rides.
I have no problem with people doing the "Chuck Bubba relay" as described in the UG so that the little one can ride Dumbo an extra time or two, but otherwise, people, if you leave the line - adults in particular, too bad. You lose your spot when you step out.
I am so sick of people whining about the "good reason" they have to leave the line and come back.
Need to pee? - do it before you get in line.
Hot and need a drink? - get one before you get in line.
Kids are tired, cranky, restless? - go back to the hotel and nap or swim.
Imagine two hypothetical scenarios. In each, you get in a line that includes 50 people.
1. Everybody is a good little boy or girl and all wait patiently in line. 50 people get on the ride before you.
2. Of the 50 people, twelve people leave the line to sit on a bench across the way, get a soda, visit the restroom, whatever. They all return to the line prior to you getting on the ride. 50 people get on the ride before you.
Therefore, while true 'cutting' is rude and should be discouraged, someone leaving the line and returning to it a bit later truly affects no one.
Bulls--t.
Those people who chose to hop out of line and get a drink, snack, pee, have just fabricated themselves another fastpass.
A lot of what Disney is about (like it or not) is following the rules. Its really not that hard to do.