No, hiding is particularly useful in some situations. Such as a spy sneaking into an enemy base? Or a civilian trying to get to the exit without getting killed.
Either way it's pretty clear that it was just some valve sillyness, the spy won't be able to do movements like in the video either...
I'd imagine almost all of the animations won't be in game it looks. Either way, the only animations that will probably take place in game will probably be just simple movement animations.
