Glasses may allow a bit more leeway in this respect, but if not using the happy headache-inducing shutters mentioned in another comment, the display method would need to be similar (i.e., two interlaced images at different angles), and you'd still need to carry around extra hardware. The RD3D is proabably the simplest way to get a 3D display to the average user.
My personal experience with the RD3D is that, yes, it is very particular about your position. You need to position your head in the center of the display area and particular distance away from the monitor in order to see anything. There's a little colored bar at the bottom of the screen that turns red as you get closer to help you find this spot.