For me, the #1 thing is the level of social intimacy with other people. As a guy, everyone pretty much holds you off at a distance, and you are treated like this impenetrable emotionless lump who is expected to fend for himself with nothing but the occasional "I feel for you man" to help out. And guys just don't get the chance to really make meaningful empathetic social connections, it's more of a "boys' club" attitude where everyone's just always patting each-other on the backs and doing activities while technically occupying the same space. Where as a girl, breaking out crying in the middle of a sentence is completely 100% normal, and sitting down to do nothing but talk about how each-others' lives are going for hours on end is completely normal as well. That sheer degree of freedom of emotional expression, social empathy, finally actually feeling like I'm emotionally alive and actually making meaningful connections with people, NOTHING can compare with that in my books. There is nothing at all about the male social experience that I'll miss. I hate every single minute that I still have to put up with it.