There are about 10 computers in this office and they are all laptops because we all use our computers on-site. For the most part everyone manages their own computer.
We want to set up Active Directory just for the single sign-on stuff and managing the permissions to shares on the NAS. I don't care about storing user data on a central machine, or probably most of the AD features.
But in my limited tests, joining the the domain means rebooting and logging in as a new user with new User directory, which is not going to fly with most of the people. I found some really hacky looking ways to copy over the local account, but doing that 10 times (and possibly breaking someone's computer) is not going to fly with me.