I would assume this is several families. Does everyone have the same budget, have they been to Disney before and do you often travel together on vacations? Knowing those things would give us a place to start. Everyone may also not have the same idea how to enjoy Disney and each family having their own room may work out better. Do you stay up late, get up early, want to race off to a park the moment it opens all matters in deciding how everyone will spend their time. Maybe renting a large house might make sense for that many people and would given everyone more space.
While it seems like going on vacation with 10 people will result in these "Hallmark Moments", the reality of vacationing together might be a lot different.