Ditto on Aladdin, line is not long, its great for all ages, air conditioned and a couple scenes, if you are up in the balcony, you have the best view in the house!
We live in Texas so can definitely relate to your time zone issues. Easy to GET up, not easy to STAY up! We would be revvin to go at 7 am PT since it was 9 CT, and the parks weren't even open yet! But by 7 pm PT, my older son was zonked out (at ages 5 and under). He could NEVER make it to the 9:25 pm fireworks...thats almost midnight our time! I would NOT recommend Fantasmic OR World of Color, the waiting and the slim chance of your kids actually being able to see anything due to the poor visibility on the stands, coupled with their exhaustion would be a recipe for disaster. Fireworks are a must for at least your oldest though, so have strollers, let the littlest ones sleep if need be, and get a spot close to the train station so when they're over, you can hightail it out of there before the crowds. Even better might be to grab a piece of plaza outside -- between
Disneyland and California Adventure and watch them from there, you won't get the castle effects or music but they'll still be huge.
Otherwise I might do a switch off with hubby and one of you stay at the hotel with the sleeping littlest ones and the other take the older one to the park to see the fireworks "proper". They are unbelievable, and magical, and the new Magic, Memories and You projection show for the summer turns the Its a Small World facade into all kinds of cool. Then another night, trade again so that each of the grown ups can see it too! It will help a LOT for your 6 year to make it to fireworks if they take a nap in the afternoon. It seems old for napping, but at Disney, it is a lifesaver and will give your child the extra wakefulness they need to stay up!
