I know this is an old thread...
But I have 2 little ones. We started going when DD was 2 and DS was 6 months. Now they are almost 4 & 2. My DD is a little afraid of the dark and some of the rides (snow white, POTC, Haunted Mansion) Everything else at MK is ok.

The best thing I ever did is but a flashlight/necklace thing. I bought it from walmart by the camping gear there are a bunch of different lights. This one has a string to wear around the neck. It also has a saftey "clasp" so it will pop off if it were to happen to get stuck on anything.

I give it to them when we get in line. It will keep them busy a lot of times in line too .