When we were there last week, they started the fastpass machines at 1pm. It was bedlam though - half of the machines had problems and tempers were flaring a bit when I went past - with the poor cast member trying to sort it out looking very flustered.
They have a single rider line. The last time we were there, my DH, DS(then 10) & I used it many times. You get to walk right up to the front of the line. They will pair you up with someone. Three times my DH & DS got paired up together though. It sure saved time.