I see the terms progressive and conservative as neutral, each having a light and shadow element. I see conservatives as those holding to the Hellenistic Apollonian wisdom tradition, embracing really smart archetypal ideas and ideals that work over time. In the Helios/Apollo myth, the Greeks realized there is a wise conservative path for the sun to travel each day--to change it is to invite disaster, as seen in Phaeton's mistake. The Founders of America enshrined many of these Apollonian truths in the Constitution and Bill of Rights. The conservative weakness is in getting stuck in areas that require development. That is why I had to leave the dogmatic wing of the evangelical residence years ago.
I see progressives as being delightfully Dionysian, not afraid to look at new ideas and new ideals, to make changes where they are clearly better. They see the developmental nature of the psyche and society, and are bold enough to oppose old worn out views and laws. However, their weakness is in mistaking "change" to be a virtue--not all new ideas and ideals are clearly better just because they are novel. As C.S. Lewis has written, "We all want progress, but if you're on the wrong road, progress means doing an about-turn and walking back to the right road; in that case, the man who turns back soonest is the most progressive."