Hi. nVidia desktop manager enables window spanning across dual monitors - just an example...
On the other hand, Revit MEP allows you to have the application main window in one monitor, and the System Browser and Project Browser in the other. It saves you space to work, but unfortunately Revit "forgets" these seetings when you close the application. Next time you start Revit, you have to set it all again....
Overall, dual monitors are still a good way to improve productivity.