Why is it important to think in terms of stops at the enlarger? How will that benefit me?

I guess I can't see the advantage to the test strip method that Kal has described (I'm feeling dense today). If I determined that a 36 second exposure is too weak, a 38 second exposure is too dark, and a 37.5 second exposure would be just right, how can I discern information this accurate using the method Kal has described? When dodging, burning, or creating straight prints, I find a second of exposure here, and a second of exposure there to be quite critical to the final print. In Kal's method for example, there would be 32 seconds of exposure time residing between the 32-second and 64-second exposures on the test strip.