No, you're not alone.
But there are actually loads of designs with an aft head: Pacific Seacraft's Flicka 20, Dana 24, Crealock 31, and Crealock 40, a whole slew of recent J-Boats, and plenty of others.
Heck, we even have some old threads around here devoted to the topic. Let me see if I can find you one. This one's a bit dusty, but here you go:
Aft Head