I'm a member of a team on SO, so I have a preview of the responsive design that'll be coming soon to the rest of the network. To reclaim more space, I'm using a Stylish style to shrink the left nav until SE makes it collapsible as planned. Even so, profiles on SO (main site and team) are now much wider, pushing information that used to be visible out of view.
Here is a screen shot from my MSE profile:
In contrast, here's the top of a profile on SO. Notice how much wider the big gray boxes (rep graph, badges) are compared to MSE, pushing the "stats" box (and user name!) out of view:
The push to the right doesn't just affect that stats box and recent rep (shown for SO below). It also affects some handy controls. MSE:
There's plenty of room to show profiles at their current proportions; you can see in that first SO screen shot how little of the left nav is visible. I lost way more off the right side than the left nav consumed. Can we fix that?
To those who would say "get a bigger window" (or "don't zoom your fonts"): the whole point of responsive design is to fit within the space given. That browser is about 1100px wide; it's not ridiculously small.