I see several other commenters have been having trouble with this upgrade as well. I just find it to be not user-friendly in many ways. (I agree with most of the other commenters) It's not obvious how to upload to a folder and now my staff that doesn't use CC very often has images spread everywhere when they should be in folders. In regard to document uploads, no longer can you just replace a document in the upload document window. You have to exit out of what you are working on, go into the library and fiddle with it in there. Finding the stock photography is very awkward. The whole thing is rather clunky and not intuitive at all. If I had the option to turn the upgrade off, I would do it in a heartbeat.
Also, it would be great if you had the option to make a URL stick with an image. We utilize several logos on a recurring basis and it would ideal if the URL we assign to them was a part of the image file.