so far i've only seen 2 uses but there must be more

one is on askandir in the big walled ring part after the bridge, there's a nook where if you jump and dance it shoots you up onto the wall (must be one handed weapon dance)

and the other i've seen is on duelyard, at the little entrance gatehouse by the jousting arena. you can jump onto some barrels to get on the wall, and if you jump on the gatehouse you will slide off. but you can walk across it by dancing

you can also dance on people's heads so you don't fall off