When I had a proper AT before, I would select "2" while in stop-and-barely-go traffic. My old Legacy would actually lock the 4EAT in 2nd gear; this caused it to get up and go more slowly, but also prevented unnecessary, continuous shifting. Besides, I'm not usually the type to ride the guy-in-front-of-me's bumper, so I could typically get through traffic without being annoying to the people behind me, by simply revving up to 2-2.5k RPM and then engine-brake down when things slowed down again. If I timed things correctly, I could sometimes get through traffic without having to hit my brakes! On longer trips, such as on the NJ Turnpike, where the most likely cause of slowdowns on one side is rubberneckers ahead of you for something on the OTHER side, in which you never truly stop-stop, but you can be delayed over an hour just for that!
With Subaru's Eyesight and X-Mode I rarely use a lower "gear" in either of our current CVT's now during inclement weather. It does a pretty good job of raising RPM and engine-braking while going down hills, too. Rarely do I find myself having to manually change "gears" to help with engine-braking in our Subies.