When I configure a new router at my home, routing is barely a blip on the radar. I mean, everything that's not local goes upstream. Switches just swich, I plug in cables and they work.

The things I need to think about are precisely the things that changed radically. Firewall rules aren't the same due to prefix changes and no NAT. DHCP isn't the same, DNS isn't quite the same, distributing NTP servers isn't the same.

Almost nothing of what I knew about configuring my home router for IPv4 has transferred to IPv6 configuration.