Code Metrics analysis where it gives a maintainability/complexity score.
we know big Os and little Os but rarely get to implement or be aware of them cognitively while developing. This feature in VS allows better coding.
Sequence Diagram on fly.
This feature is wicked. Sometimes a developer doesn't know where the logic is going to and what all happens in between. This sequence diagram allows to have better view of code process.
try { } catch { } finally { } apparently has penalty as much as -10 for the maintainability index.