This video shows the concepts explained in Tutorial 1-11 explaining how to Zoom and Pan within your drawing.
When you not drawing, you should be preparing to draw. Using the Zoom and Pan tools effectively and quickly allows you to set up the next stage of your drawing.
If you can't quickly (less than second) find out exactly where you are in a large floor plan, you need practice. These techniques should become instantaneous to you while drafting.
Practice them and remember that there are different options for different situations.