I was worried about boredom creeping in standing in line the first time we went to WDW......so I got the hidden mickey books, found lots of trivia and such online (here and just searching around for trivia or scavenger hunt type things). Put it all on my smart phone categorized by ride.....and then we barely used it, lol. Ok, we do go at "slow" times so waits are 15 minutes or less for all except the truly big rides and those we do FP or don't ride if it's more than 30 minutes......but even those "long" waits we found it was fun just to talk about what we'd already done, what this ride was going to be like....talk with those around us, etc. Of course, my girls were 9 our first trip so it wasn't like having toddlers or such....for them, I've seen people bring bottles of bubbles for the kids to chase and pop, but I've also seen some rather hyper kids running into others in line and being annoying with chasing bubbles, so judge your kid before being a pain in line, lol.
Seriously, Disney does a great job of making the line que interesting....even when you've gone through the line a few times there is still something you missed. I think only someone with little patience at all would find the lines truly boring.....not fun, yes, as everyone would rather just walk on each ride, but not nearly as boring as waiting line at the grocery!