Yes, group bonding is something I directly want, because I've enjoyed it in other contexts before. For one thing, I'm not that good at making casual friendships, and given a casual social setting, I won't get very close to people. I wouldn't have traveled to New York just to hang out. Participating in a more structured group activity makes people more likely to actually get together and connect with each other. Also, ritual is good for bringing up topics (death, hope) that are hard to bring up in casual conversation. Once introduced in a structured way like a ritual, the topics are easier to address afterwards in unstructured conversation.

Also, I think community support is a good thing that most of us don't have enough of. Group bonding helps produce a norm of helping each other, even if we're not especially interested in every group member as an individual.

I imagine group bonding is valuable because of reasons like "I want to adapt those values and behaviors, because they seem useful, but I can't individually self-modify - I should find a group that follows these behaviors/values, so that I can adapt them via peer pressure." At least, that's my perspective.