I have usb debugging checked, mass storage option, moto drivers installed, I plug in the usb cable and automatically get autoplay options for my Bionic drives. Devices listed below:
I can see everything on internal memory (sdcard = MOT) and the microsd card. I am set to view hidden files and I am rooted, if that makes a difference. I didn't have to do any of the check/uncheck usb debugging or rebooting.