I've finally got round to writing a visualizer I've been wanting for years, one that will give a decent representation of a SQL Command object, allowing you to view both the connection details and the list of parameters, their properties and values.
Below is a screenshot of what the visualizer looks like when you press the little magnifier when hovering over a Command object instance.
Available free from my Visual Studio 2005 Tools area as a VSI which will automatically install it.

Update:
If your having trouble with the vsi try renaming it to a .zip file, opening the file then copying the SQLVisualizer.dll to your My Documents\Visual Studio 2005\Visualizers folder.
I will research why the vsi's are occasionally giving this error.