All of that stuff is still easily available:
With the new display layout, look down at the bottom of the light gray box on the left which shows your username, avatar, etc. and click on the "Show Posts" link to see all your posts - and click on the "Show Stats" link to see your general stats, the posting activity by time" bar graph, and the most popular boards by posts and activity lists.
However the old display and the old way of accessing everything is still also available. If you click on the two arrow heads to the far right of the Profile Info/Modify Profile/Actions drop-down menus, everything will go back to the way it was in SMF 1.1. And this is true wherever you see those two arrow heads to the far right of any of the drop-down menus.