I do not like it at all. Far too much white space, font size too large. Dislike the serrifed font used for headings, much prefer sans-serif type faces for headings. There is lack of definition between name and post and next name and post.
There is nothing to anchor the eye as you scroll down. Scrolling down on the 'I'm on' heading, I couldn't focus on anything as it was too diffuse and the extra space taken by every heading meant that it took much longer to get to the last of the still active posts. I gave up before I got there.
It took time to find the 'Last day heading' It seemed to be part of a strapline under the logo, so not an obvious place to look.
This layout seems to be designed for the GN member who browses GN in a leisurely manner while enjoying a quiet cup of coffee and might spend some time on it posting and and reading.
It is useless for any like me who nip in and out during the day zipping down headings for anything new. To be honest I loathe it. If I stay on GN it will be despite the new layout, not because of it.