When X1 came out, I made a a decision to abandon all my old work flow and start over.
At first I found myself resizing everything all the time. But once I got use to the key binding's for the Inspector, Browser, Control Bar, Multidock, my need for a second monitor became less and less. I now have X1 stretched across both screens (which is real nice) and just use the hot keys to navigate around.
Once I became familiar with the above, that's when I really started to make use of the smart tool.
And then it all made sense to me. And I am glad I decided, in the very beginning, to give this new UI an honest try.