In a discussion today, I realized another reason I like NAT and am not fond of IPv6: your ISP is now back to being all in-your-face about how you administer your network.  They have to give you a route to more than one IP address, and a router that will help subdivide that subnet route to secondary routers on more subnets if you have them.  If they choose not to do that, you're screwed.

Now that I'm thinking of it, I remember those days from IPv4.  It sucked. I hate asking for permission from people who will identify me as a "power user" and charge extra to do what I want.