Justin, I think that only applies to old, non-transformer style switches. I'm not sure but the consensus seems to be that it does use less energy. If the energy is being absorbed by the switch, that would be a huge fire hazzard. Scary thought.
(Online sources, note what they say about bulb life too!):
8. Do Dimmer switches save energy?
Yes, most dimmers today do save energy. Older dimmers used to simply cook off the power you did not want to use. Today's dimmers interrupt incoming current thousands of times per second (invisible to the human eye) saving 10% in energy costs even when on full, the life of your bulbs is also greatly increased.
From "8 ways to save energy":
Want to affect the mood and save energy? An effective way to quickly change the mood of a room is by dimming or brightening the lights. A softer light results in a more comforting, relaxing atmosphere. Brighter lighting is more suitable for normal room use and reading. An easy way to control your lighting is to install a dimmer switch. Dimmers also reduce energy consumption by cycling light and increasing bulb life.
Most dimmers cycle the light on and off 120 times per second – faster than your eye can detect. The longer the light is ON versus OFF, the brighter the light output. Likewise, the longer the light is OFF versus ON, the lower the light output and the greater the energy savings. An added bonus is the incredible increase in bulb life from operating at a lower light output (filament temperature). Dimming the light by just 10 percent more than doubles the bulb life.