I went to a mennonite wedding once several years ago. One thing that I had no appreciation for before that was how splintered the overall community was. LOTS of tiny little "denominations" as you put it, eac based off of what seemed to this outsider as the most minor of differences. The wedding itself was a Big Deal in the larger community because it the bride & groom were from communities that normally were barely on speaking terms due to their faith differences.

I thought this was absolutely fascinating considering how the outside world barely understands the larger differences, like amish vs mennonite, and tends to lump the entirety of the Anabaptist community into a single bin.