Thanks for checking out my blog, Tim. I would agree that the Weminuche Wilderness has some of the finest scenery in Colorado.
My experience with interstate noise and crowds on the Gore Range Trail was quite different than yours, though. As I mention in my trip report, I was aware of I-70 only for the first mile of my hike. After that, it felt as if I were in the middle of nowhere. Similarly, most of the other hikers I ran into were day hiking to either Wheeler Lakes or Willow Falls, at the very beginning and end of my trip. On my second evening I did observe a couple of trail runners who had run up from Frisco along Meadow Creek. Other than that, I was totally alone.
So, I think it's possible to obtain solitude in summer while relatively close to civilization. The trick is to avoid holidays and weekends and, of course, fourteeners. ;-)