As well as playing with Code Metrics, I've also had fun with the Code Map (new in VS2012 Update 1).
These views all feel a bit complex at the high level:
However, if you look at a lower level - at a class - it can help you get a feeling for what a class does and what the relationships of its methods are.
For example, here's the code map inside the new Swiss Parser:
If you want to have a play, then right-click in Solution Explorer and choose "Code Map"...
One bit of advice: I would start in a fairly small solution if you can - the "Code Map" seems to do several builds and several index operations - so on the whole of MvvmCross it can be a bit slow at times!