My Moto Droid X's car mount was a hybrid. It had a micro USB connector on the back, which the bracket then passed through to the phone, but you still had to plug the audio jack in directly to the phone. The Verizon Galaxy Nexus bracket is only marginally worse. I'd have one already, but I have a $100 BestBuy gift card burning a hole in my pocket, so I want to buy the car mount (and in-home HDMI adapting stand) with that gift card, but BestBuy has none of them in stock. They're not even on their web site.

Sigh.

The only thing that was really beneficial from the Moto solution was that the phone, when mounted in the bracket, automatically launched the "car dock" application, which turned the screen into six huge buttons that you can easily press from far away. Of course, none of them did anything useful, so you ended up killing the car dock UI to go back to the regular interface. My most common mode of using this was to flip back and forth between the nav system and Pandora.