Church Polity? Really?

There is no shortage of books and conferences and blogs and even movements on the church. But how often do we hear talk of church polity? If anything, many avoid the topic. After all, church government is said to divide Christians, not unite them. Why pay any heed to it at all? Is it that important for the average Christian and for Christian discipleship? If so, how? Does the Bible speak decisively in this area? And if we think it does, how firmly should we hold our convictions when other Christians disagree?