HI Shelley,
Well....it most likely will be crowded. But don't fret, with some careful planning you should be able to work around the crowds. The first thing you need to do is take this time to study all the attractions so that each family member can create the list of "these are the things I really want to do." By the way, to help with the research, make sure and order the free planning
DVD and
customized maps from WDW. I'd also sign up for the weekly newsletter from www.allearsnet.com and
Disney LinkIf you are staying on site, utilize the Extra Magic Hours in the mornings and always arrive early. If you are staying off site, I'd travel in the opposite direction of those morning bonus hours - but still arrive early. Your next strategy is to utilize fast-passes; they work wonderfully to avoid standing in line!
Finally, just remember that the best laid plans seem to often hit detours, so keep the idea of being flexible in each day's plans. Some of our best moments have been those that weren't part of the planned agenda.
Wishing you a magical trip!