I'v switched and really like the new profile look. It looks neat, organized and polished. One of my big complaints about (and reason for pretty much never a whole lot of Internet sites (and not just writing sites but sites like web medical-information sites) has always been that the user gets to a page and thinking, "What on Earth is all this mess?" So many sites/pages are a big mess of list lists and adds mixed in among other link ads and link lists, only to lead to other pages full of the yet more link lists and ads.
To me, the new profile offers a fresh looking page that lets the user know exactly what is what and where s/he can get to it. This isn't the only site that's made similar changes, so, to me, it looks like the Internet may be finally growing up.
Something else about the new profile that I think is nice is that it offers a little bit of a framework for people who aren't very skilled at, or inclined toward, organizing and profile well. So, people now have the flexibility of the background image and yet that "framework" that keeps the profiles consistently organized and presented. I also like what they've done with the bio. It's set up in a way that doesn't highlight how "there's nothing" on the profiles of people who don't bother writing more than two lines for a bio, but it also give the option of having a longer one for anyone who has one, or is inclined to bother reading a longer one.