Weight the increase in functionality relative to the "decrease" in usability. I think the additional functionality you get far outweighs any reduction in usability (which for the record I think is not that bad).
I have iDrive in my car.
I have iDrive in my car.
Think about the cheap TV sets with no buttons. A ton of menus just to change the contrast. Or microwave ovens unusable without manuals.
EDIT - What do I say cheap TV sets? All TV sets.