BuddyPress.org

Well… this doesn’t help… but really… as far as popular CMS tools go… the WordPress backend is about as easy and intuitive as it gets. I find most clients take to it pretty quickly and easily and end up loving it and using it a lot. Compare that to Joomla sites I’ve worked on where the clients end up abandoning the site because it take a computer science degree to wrap your head around it’s confusing interface and concepts. Again… I know that doesn’t really help you.

Have you looked at limiting user roles and screen options to streamline the WP backend? I always set clients up with something less than full admin privileges and turn off a bunch of screen options they won’t need or understand.