The only time I get any visible movement is when jumping comes into play, such as the last boss in Niuzao Temple. This is due to the fact that the forward movement in the air {jumping} doesn't have a "stop". If you're moving forward while jumping, you're going to land forward of your last position.
I did test with separate movements {down= forward, release=back} but that setup lead to a lot of loss of the key releases for the movement key. This is the same sort of thing you see with click to move getting stuck, modifier keys acting like they never got released, perpetual upward movement when flying...things like that. Which means runaways and toons inching past or away from the target, and that means having to use IWT more often to correct it, which leads to even more chance of runaways.
If every press sends the explicit commands to WoW that the key has been pressed and released, you don't run into the issue where WoW might lose or miss a released movement key and they stay where they should be.
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