We used to do rock/paper/scissors (youngest is now 16), and other "hand" games -- Itsy Bitsy Spider; Here is the church, here is the steeple; stuff like that. Many rides have stuff to look at in the lines. Waiting for Body Wars, my DS3 at the time was fascinated with the part that pretended to be sterilizing you. When we went back later, there was no line and I was trying to just walk right on, but he stopped to "sterilize" himself like he did the first time. LOL! It's still one of my most fond memories of taking them to Disney World when they were little. We went before there were Fast Passes and I found that there was so much to look at and talk about, the kids didn't find waiting in line to be too frustrating. Like others said, talk to those around you, or make up stories and enlist your child to help you think of what happens next. If they're familiar with the ride or the story behind the ride, ask them to think of what they might see. Like, for Peter Pan, they might see Captain Hook, Wendy, etc., or for Dumbo, ask them how he could fly, etc. I think one of the main things is that if you act calm and relaxed, that helps the child, too. Just treat it as matter-of-fact (and in the days before Fast Pass, it was! LOL!) that standing in line is just something you have to do sometimes. I even think sometimes the wait makes the ride more enjoyable when you finally get on it. I'm sure you will all have a fabulous time!
-Dorothy (LadyZolt)