I don't think it's sectioning off either. In my church we have a women's ministry, a men's ministry, a children's ministry, small groups that meet once a week or once every two weeks (men or women or mixed - hubby and I go every two weeks to a couples group). I'm very involved in the women's ministry, I meet with my group every Tuesday morning. I don't find any of it to be sectioning or limiting. I finding to be enjoyable and and very supportive. I think it's very cohesive for the church, meaning it help bring us together.
Josie