I listen to all podcasts at 2x speed to the point where I can't even listen to them at 1x anymore because the voices sound unnatural. People talk about half as fast as people read so 2x just normalizes to a comfortable reading speed.

I watch basically all youtube videos at 2x as well (with the html5 player) to the point where I'll actually shut a video off if the only thing offered is the old flash player (and ditto applies to vimeo vids).

However, I've never had enjoyed scripted tv shows at 2x speed, I'll usually dial it back to 1.5x to watch. It's not in an effort to save time, it's that I genuinely find aural mediums better when sped up.