If it is 2 lanes plus parked cars in each direction, you will not be holding up any cars, because they have a whole lane available for passing regardless of oncoming traffic. You have to ride out of the car door zone. However if there is a significant distance (you decide what is "significant") between parked cars, I move to the right so I am in line with the outside edge of the parked cars. This allows cars to see me as they approach, and I can move out again, when I reach the next parked car, without making a violent swerve.
+1 on the mirror (glasses mounted)