I'm not really fond of the new layout except for navbar being slender even that has problems. I don't like the menu and such being so far off to the right and out of the way. I installed this plugin with stylish to get the navbar centered again.
The whole layout feels like it's more suited for mobile devices which would be fine for that but on a computer I would prefer the older layout. The activity feed I think could be made to be a bit smaller because it feels too in your face. I wish there was options for whether you want use endless scrolling or not. I don't like endless scrolling to be honest because it tends to lag for me and often gets stuck where it won't load anything else. Again, endless scrolling seems more suited for mobile than computers.