The managed debugger in Visual Studio (I am using 11.0) displays string values containing double quotes and backslashes like this:
\"{\\\"Text\\\":\\\"C:\\\\
I just found one more way of doing this in the debugger window.
Instead of
?myStringVariable
use
System.Diagnostics.Debug.print(myStringVariable, {"nq"})
That seems to stop the double quoting.
EDIT: An even easier way:
?myStringVariable,nq
Thats working for me in Visual Studio 2015