I thought that I would be able to automatically have bazqux follow all the people that I myself follow on Twitter, if I just connected my Twitter account. Did I misunderstand? Or do I have to manually add each user?
Twitter home timeline is not yet integrated (although it’s planned) so you need to add users manually. You could also add Twitter lists and add users to lists in Twitter.
Twitter integration is mostly for people who don’t use Twitter at all or want to monitor some “must-read” accounts (since Twitter algorithms may hide important tweets) so it works the same way it works with blogs and not as full-fledged Twitter client.