I've been up in one before. we took the kids to a balloon festival type thing several years ago and some of the ballonists would allow those who paid to enter the park to ride with them to help do some of the tasks.
a balloon requires at least a team of 2 people. one to fly it, one to drive the chase truck to put it in when it lands.
but it's also easier to put it away if you have more than 2 people helping, so I flew with a guy in exchange for helping put it away when we landed.
what I remembered the most was that it was so QUIET up there!