I went with my band two years ago in April and I am going again this year. I go to Disney at least once every year, but two years ago was my first time with the band. It was really fun, we had a lot of down time to just go around the park we were in for that day. There was a lot of freedom and I was the go to guy when people needed help getting places, etc. It really is a bonding experience and definitely increases friendships across the band. You grow as a band and even if your roommates are your friends, you will become the best of friends. I had a great time and can't wait to go again this year.
I hope you have an awesome time and enjoy yourself. There was no drama in my band at Disney and hopefully the same for you too. Just enjoy yourself, it is an experience of a life time, especially marching down main street with the castle behind you. Those stories will be told to the generations to come, it is just great.