Flickr’s new (May 2013) user interface: “tight ass”?

Did ya see Flickr’s new UI? Some users rejoice, some blogs tout its updated design merits, and designer/developers like me run to see what they’ve done to bring it up to date. At first glance… It’s pretty. It’s full-screen, image-centric, responsive, and their catchy homepage incorporates some nice parallax movement (since I can never remember…