You CAN actually do something like "Every 0.01 seconds" u move the unit 100 distance towards a target point, witch means something like you would have your unit on the other side of the map i a second, or you can add some model with partickles on your unit and just move it instantly...
EDIT: I remember doing something similar once... heres the trigger:
(NOTE: this moves your unit anyhow you target somewhere, even with spells)
The attatched SFX can of course be changed, but to get the right effect you have toopick something with partickles.