IPv6 and RFC 2462 provide a means for hosts to configure their own IP addresses via stateless address autoconfiguration. To me this seems like the bee's knees, and it leaves me wondering why someone would want to go through the trouble of configuring a DHCPv6 server instead. I don't manage networks as a profession, so I'm guessing that there are some obvious simple reasons why one would want to support DHCPv6 that don't occur to me. Could someone please elaborate on what these reasons might be?
DHCPv6 provides more control to the administrator in assigning addresses. If you really want that sort of control over your IPv6 addresses, you don't understand IPv6 yet.
It also can be used to provide additional configuration parameters beyond the basic address/gateway supported through autoconfiguration. An example might be WINS servers, NTP servers, TFTP boot servers, and other less common options. None of which are worth the pain of deploying a DHCPv6 architecture in my opinion.
Stick with autoconfig.