Sure they are used. They are used for a multiple of reasons in the military. Aswell as being used as support for long range recon patrols, they are used by Dispatch Riders to carry important documents from place to place. Also an offroad bike can go places even a 4x4 would have trouble getting too, and they are often faster also.
I would like to see other motorbikes made purley for East and West sides to use.