Actually it's lack of MTP support in OS X.
Wrong. It's Google's decision to abandon direct mounting Android drives in ICS in favor of the MTP standard.
Which is the right move in the long term, although it's certainly causing some pain in the short term.
OS X has perfectly find support for media devices, and has worked fine with every digital camera, SD Card or other card reader, etc, that I've attached via USB in the past decade!