I agree with much of the advice you have already been given. You know yourselves, and what works for your family. I wouldn't worry too much about crowds. I'm thining it won't be too bad when you are there, lots of people wait until Christmas or New Years. We went over New Years 2008-2009 and WOW, talk about crowded. It was wonderful though, and I wouldn't have traded it for anything. Also, the weather will likely be good that time of year.
Now I'll tell you what works for my family. It's me, my parents, and my two boys, one is 12, the other almost 9. We're going back in August, I just told them tonight!
We are on vacation, and I'm not dragging myself out of bed for morning extra magic hours, or rope drop. We usualy stay in an RV in Fort Wilderness Campground, so we make many of our own meals. We have breakfast and get ready. We typically get to whatever park we start at somewhere between 10 and 11 ish. We do a few hours in that park, and go back to the campground in the afternoon, maybe 2 or so. This is more important during the hot months, but we often still do it when it's cool. We hang out, have some down time, take a nap, go to the pool, whatever. We often have a late lunch/early dinner. We head back to a park somewhere around 4 or 5. Then we stay late. I usually stay for evening extra magic hours, especially at Magic Kingdom. We try to plan for at least one down day around the middle of our stay. You don't realize until you go just how exhausting it can be.
I do do morning extra magic, and often don't go to the park that has them early in the day. It seems to me like the parks with them in the morning tend to be more crowded for the first half of the day. I love evening extra magic hours. We were there in June last summer. Our last night there Magic Kingdom had evening extra magic hours until 2AM. We had a good rest in the afternoon, and staying until 2. I think we did more in those 3 hours that we had all day. The park will often still *seem* crowded, but many of the people are not resort guests. They can still shop and buy food, but can't ride anything or see shows.
Anyway, that's how we do it. If you are morning people, try to morning extra magic and see how you like it. You aren't going to see everything, just decide ahead of time the things you feel like you must see. There are so many memories to make. My 12 year odl told me today that he is still jealous that his brother went with me to buy popcorn last time, and got to pet a duck and he didn't. There was a duck eating popcorn off the ground near the stand. One of the things the really LOVE is these silly boats over by the Jungle Cruise. You put (WAY TOO MANY) quarters in and drive these little remote control boats around for like one minute. Wait and see what kind of cute little memories your family makes.
Have fun, take tons of pictures, and enjoy watching your little girl's face