Comment by VitalyB

At least some of the features you've brought up in the article can be done with BugAid (for C#). For example, the ability to "visualize" the data in a function by replacing the variables with the actual values can be done, albeit in a different way (http://www.bugaidsoftware.com/). The other feature, like a documentation that shows whatever you're looking at, can be achieved partially with Visual Studio by itself and Resharper (http://www.jetbrains.com/resharper/).