I just went last thanksgiving with my wife. It was getting close to Christmas time, so all the shows were Christmas oriented, so i cant comment on the standard shows.
We stopped at the Bass Pro Shops headquarters and the indoor fish and wildlife museum in Springfield on the way down, took about 2 hours, we both had a good time.
In Branson, as far as shows I would recommend: we saw the Haygoods & Kirby Van Burch (magic show), I would recommend both. I heard good things about the riverboat dinner/show & dixie stampede.
Spent a day at Silver Dollar city (basically a branson theme park, roller coasters, rides, shops shows, etc). Went to the lake south of town, saw the trout fish hatchery which was interesting. Spent an afternoon at Branson Landing (the stripmall in the east side of town, renovated and looks very nice)
Went to the Titanic Museum, which was very unique too. Of course we went putt putt golfing at Pirates cove too. Overall, it was a great time, so much to do, it just a matter of deciding what you like and doing it.
As far as traffic, we stayed off the main drag through town when we could and used what they call the blue and red routes, traffic was much better on these roads.