The Sequencer is missing a bin system to organize imported footage. By very little means I believe that the Outliner could work as such. It has already the ability to show scenes and the footage they contain:
The only thing missing is the ability to drag and drop from the Outliner into the Sequencer(like 3D objects into the 3D View).
To add a bit of icing on the cake, the current Sequence outline view mode could be expanded into showing all scenes and the footage in them(the scenes would work as bins).
A double click on a footage file, could switch to that scene, with the playhead placed at the beginning of where that footage is located in the timeline.
Same thing with double-clicking scenes in the Outliner, that could also be used to switch to them.