At first, I had a difficult time hearing the commentators over the vuvuzelas, but after a few matches it was okay. Perhaps the broadcasters adjusted and were able to push the vuvuzelas more to the background. Perhaps I just got used to it and was able to more effectively ignore the background noise. Most likely it was a bit of both. After I and/or broadcasters had adjusted, my wife (who doesn't like football) passed by and asked what the buzzing noise was, so it was still noticeable to her.
I wonder if vuvuzelas will appear in Brazil in 2014?