The thing is, I didn't see anything new that made me wish to use it. I just saw new part to the interface that seemed useless to how I use gmail, so I went back.

Inbox bundles are a revelation. I guess it's a shame Google failed to get the message out better.

I, for one, hated bundles. They didn't give me enough control. I'm glad they worked well for you.

The key feature is bundles _in the inbox_

Folders and filtering rules never worked for me because they gave me multiple "to do" lists. It's vital for managing complexity to have a single queue to work through. If you want to use your inbox for that - then traditional email clients fall short.

If something is filtered out of my inbox then I usually end up forgetting about it. If I can't group things in my inbox then it becomes overwhelming.