Bar on the left: shit
White layout: shit
Playlist layout looks like: shit
Send them that "feedback".
I pretty much said the same thing myself in my feedback submission. You can even "highlight" areas when sending the feedback, so I just highlighted all that utterly wasted space and was speechless. "Duh?"
Last time they really pissed people off when they started showing any activity whatsoever for those you subscribed too. So instead of originally just seeing what they uploaded (which is probably why you subscribe...) you started seeing them Like, Favorite, and do anything, like they were suddenly your friends or something. That was awful, and it's still around but thankfully the option to just see their uploads was added in after the outcry.
Hopefully they get enough crap feedback again and change things back or something. Can't always stop a website from changing by hot damn, 5 times a year now is just stupid. Don't fix what isn't broken.