-used as an alteration spell
-You could hold it down like a trigger (for consoles) have it drain magic slowly like detect life/telekinesis.
-Make you move faster like a run speed or horse run speed even without using up stamina.
-since mages cannot cast from horseback this would give them the ability to move more quickly, let go of the spell, land then use magic more quickly than dismounting a horse.
-making a highly magic oriented character usually means a low stamina pool, so slowing down often. or having to use healing spells with the regenerate stamina perk in restoration while on foot.
-it would look cool and make you feel more like a powerful mage if that's what you are focusing on.
-move quickly over water.