Personally my perspective on "why go to church" has changed since coming to a more clear understanding of what's meant when we call it the Divine Service: We go to church so that the Divine, God, may do Service to us. It's not so much about relationships with other congregants - though the "gathering together" aspect is important - but about the gifts God gives us when we gather together. Namely the gifts of his Word, the Sacrament of the Lord's Supper and the forgiveness of sins. 

When I come out of having attended the Divine Service I'm edified by having received those gifts, having sung praises back to God for those gifts and feeling eager to come back the next week for more.