I hated the new layout at first, but I yielded eventually and had a Google+ made (since all I had to do was type in a name and it doesn't even have to be my real name). Now that I've done that I'm actually seeing benefits to the new layout. For instance this button right here:
I can see who replied to my comment, +1'd my comment, and whoever replied/tagged me. Let's be real, I haven't used Google+ prior to this at all, and I don't have any friends on G+ obviously, but these notifications help me know what feedback I received for whatever comment I posted. In the previous layout, I wouldn't know if people thumbed up my comment or not, and I would only get a message in my inbox if someone replied to my comment, and lord knows I can't be bothered to check my inbox all the time. In the new layout, all this sh*t is available for me to check with just a click of that ^ button right there. Convenient as sh*t, I love it.
Regarding the comments layout, my only gripe is that if people have shared the video, their "share" shows up as a comment as well, which I find useless since it doesn't add to the discussion in the comments section at all unless they say something while they share the video. Other than that, I'm completely fine with the layout, and I like being able to view top comments in descending order.