The next time I got up to Alta for my "exercise loop," I did exactly what I did when I went to Cecret Lake. Except I took the low road and didn't go to Cecret Lake, which was preferable all the way around. As before, I parked above Albion Base and walked up the Summer Road until I could access Albion Meadows. From there, I went up through the Sunnyside beginner area to the Catherine's Pass trailhead, then continued up to Catherine's Pass. The morning was lovely and cool and there seemed to be slightly fewer people on the trail than the time before.
From the pass, I continued up to the trail junction for Sunset Peak and turned right to go to the top of Supreme. In the week that had passed, they had gotten all the new lift towers installed, so that's progress, I guess. I continued down the cat track/access road and again turned off on the trail that headed in towards Devil's Castle. When I got in under the Apron, I got scolded by, and then was lucky enough to see, two busy pikas, scurrying about gathering grasses and other vegetation for the winter.
After I crossed that section, I kept to the right for the low road, where I'd seen some MTBers the last time. This section of trail is pretty and shady and I had it all to myself. Even though it looks so different this time of year, not covered in twenty-plus feet of snow, I eventually recognized where I was from having skied in there with H in years prior. The trail brought me out well below the climb to Cecret Lake and although I did start to encounter people at this point, it wasn't nearly as many as the time before.
Now, having done both the high road and the low road (eight miles total hike), I can confidently say that in this case, I prefer the low road (contrary to Alta's unofficial motto - for traversing and etc. - to "get high and stay high).