Going to Disney as a group - How to plan for success?

I went to Disney with a total of 8 people and learned a lot about what not to do.  So I thought I would put together a list of expectations.

• How are you getting to Disney?
• If you driving how often do you want to stop?
• What vehicle will you take?
• What are you going to do to make the trip entertaining?
• Is there going to be quite time required in the car?
• How much stuff is there room for?
• What are you going to do with other stuff that does not fit?
• Who will get snacks for the car/cooler?  
• How are you going to split expenses?
• If your flying who is going to book the reservations?
• What time do you want to leave?
• What time do you want to arrive?
• What time do you want to leave Disney?
• How are you getting to the airport?
• How are you getting back from the airport?
• What vehicle will you take?
• How are you going to split expenses?
• How long do you want to stay?
• When do you want to go (leave and return dates)?
• How do you want to split up rooms/expenses?
• Do you want to use the Disney Dining Plan?
• What plan? Everyone in the same room has to be on the same plan so be aware in planning.
• Where do you want to eat?
• Who is going to pick the restaurants?
• Who is going to pick the times?
• Who is going to make the ADR?
• How much time do you want to spend together?
• How much free time do you wnat?
• What time do you plan to head to the park each day?
• Do you plan to come back to the room during the day?
• What time do you plan to be in bed each night?
• What parks to you want to visit?
• Do you want to go to the water parks?
• Do you want to go to Disney Quest?
• Do you plan to take a day "off" from the parks?
• Do you plan to do anything offsite?
• What resort do you want to stay?
• Do you plan to get the Photopass?  
• How are you going to split cost?

The biggest caution I have to you is plan to get in the parks early and if the others that are going with you don't want to do that leave them at the resort and meet up at a designated lunch spot or have them plan to text the group when they leave the resort.  If you want different sleep schedules either don't get adjoining room or keep the door securely shut after a predetermined time.  The other caution is be aware about splitting cost and have a plan in place before hand.  It might be a good idea to have a combined budget that can get approved before leaving home.  Include some unexpected issues like what happens if the car breaks down or what happens if no one can drive any longer and you need to spend an unexpected night, what is an acceptable cost.  Also, have a plan if someone gets sick or hurt.  Don't leave it to chance you might end up not coming back with friends.