Premiere Pro CS6, and later
We have Standard Tracks as the default audio track type for most sequence presets in Premiere Pro CS6, and CC so the situation described in the above video does not happen too frequently any more.
A related issue does happen with frequency, however:
Some users have trouble dragging a clip into the Timeline with audio. Only the video or audio portion of the clip appears.
Make sure video and audio is patched in the Timeline, then drag the clip to the Timeline. In certain cases it is not automatically patched.