Kellogg is more of party school than it's peers, but 1) there are plenty of introverts 2) we are all near 30, so partying is different than undergrad....heck, a ton of people are married with kids
We dress up in costumes a lot, and there are a lot of parties, and people are friendly, outgoing, and supportive... Unlike undergrad, everybody can handle their liquor, and there isn't the drama associated with it as there is in undergrad. On average, a school like Booth will definitely have a stark difference with people being more quanty, academic, and introverted. But, you can find all types of people at all schools.
Keep in mind, we have some of the best employment figures and are a top-5 school, so people are still wicked smart and get **** done. They just have strong social skills and don't want to sit in a library studying 24/7.