The way BB is broadcast on TV now (started by ABC/ESPN), the viewers at home really get no feel or appreciation for the crowd atmosphere. There is very little (relative to what it used to be) crowd noise added to the audio, and as you mentioned above, the majority of the crowd is darkened out on the video.
In another thread I posted an old NBA on NBC Lakers clip from the early years of Staples, before ABC took over the NBA broadcasts. Much different, and IMO, much better than what we see now. The crowd was well illuminated and well represented in the audio. Marv Albert was drowned out by the crowd noise on the buzzer beater shot by Horry, as it should be, because Marv doesn't really matter at that instant. The crowd was well visible in the background going crazy (which is not typical of a Lakers crowd).
Today, you hear a game announcer comment on how loud or how crazy the crowd is at a certain point of a game, but it really doesn't really sound or look any different from any other part of the game.