Yes if the jittery.jumpy gifs are aligned correctly the stereoscopic effect can be really pronounced, and I think personally more comfortable to view than with glasses on.

Sometimes the people making these dont line them up well, but you can edit it and make your own and line them up correctly to get the effect right. Some of them are very "3D" which I think is based on subject distance from camera. Objects in the close to intermediate distance are quite pronounced, scenery and land scape less so.