@Ying Chi: On behalf of the debugger team:
"Unfortunately, Visual Studio does not provide a way to view the contents of a matrix better than what you get by expanding it in the watch window. If you want to see the data in its rows and columns, your best option is to write a helper function which dumps the contents of the matrix into a global string buffer, using whatever pretty format you desire. You can then call the helper function from the watch window and use the string viewer (click the magnifying glass to the right of the 'value' column) to view the global string that the helper function populates."
Also, "the traditional way to do better native visualizations for collections for the debugger is the natvis file: