What they said.
And I'll add- use them!! I once hopped in when Everest was running an hour wait. You literally turn the corner from the line entrance and find yourself in the coaster loading area ready to be inserted into an open spot. I was going up the hill in less than five minutes from entering the queue. Just don't be one of the bozos who does get in this line and then acts incredulous when they aren't putting you with your SO/child and demand to be put together (which they probably will cave and do, but it defeats the whole purpose, and makes everyone wait longer).