Now I'm curious: can I have this "plug and play" Arduino on my Mac? I would be ready to switch to Windows if that were the only option.
My Uno is seen as a comm device, it has something in the firmware that makes the Mac create a usb port with a serial terminal on top. I've tried linux and I still get a usb serial port. Didn't try Windows, I know it requires drivers, but I see people using COM3, COM4... so I guess it's the same.
I know the Leonardo is smarter and can emulate a keyboard or a mouse attached to a Usb host interface using a serial protocol, but that's the Leonardo.
The bottom line, I'm afraid, is that people like me are unaware of this "plug and play" stuff even if they are always plugging the Arduino to a Usb host interface and playing with it.