if I were doing Fantasyland first (I hade 6 & 5 boys and then girl just 2 so we head to Adventureland first), but my sister was the opposite and went to Fantasyland...I know she did line for Dumbo and sent husband to get Fastpass for Peter Pan, ride Dumbo, ride Snow white, Small World before they get crowded, depending on Fast pass time ,Carosuel, then Peter Pan. Then be in line for 10 am at Ariel's Grotto.... (this was a EMH morning).
We went to get Fast Pass for Jungle Cruise did Alladin, Pirates 2x,

Splash, BTMR, back to Jungle then over to Fantasyland for DD2 (we were able to get FPass for PP, then we hit small world, carosuel, lunch etc...and did PP finally.
We found as long as we got to Fantasyland by 10:30/11 we were still okay with most lines and using FP. She did miss ariel's grotto and Dumbo (she did Alladin instead). Then as we headed over to Tommorowland we grabbed the Pooh FP and took her back later by herself.
I'm not usually a divide and conquer mom...I feel like we all need to compromise. It's a FAMILY vacation. My boys are pretty good if they do Pirates first! We use the FP as best we can and walk ALOT.
WE do AK and MGM, but honestly with those ages MK is just their favorite! We could probably spend 4 out of 6 days there easily and they wouldn't be bored. We'll see this year if this all holds true...boys are getting bigger and DD knows who the princessess

are now, but on the up side she's a very tall little girl and she may be able to do some of the rides with us this year which would help!