A suggestion from my experience using the new interface: "bulk edit" is the last option in the left column. With a lot of types and tags, it's really annoying to scroll down to the end to reach it! Putting it on the top could be a solution (you could let the user choose the position with buttons drag&drop or confiuration options). Otherways, elements in Types and Tags could be in a inner level collapsed at starting that coul be expanded when needed. Grouping the tags would be another help to manage them better, they grow really fast!