I think this app may be what a few of you folks have been waiting for. It scans your Google Drive and determines which files and folders are shared with which people and you can remove folks very quickly if they shouldn’t be there. Good times!

Who Has Access – Chrome Web Store

Find out who can access your Google Drive. You’ll be surprised. Find out who can access your Google Drive. You’ll be surprised. – Analyze your Google Drive share options for all your files and folders. – Discover who can access what in your shared folders. – Remove the people that shouldn’t have access and feel better.