One application Andrew forgot to mention is narration, which is a situation that happened to me today where VocalSync really came in handy. I had done a training video and decided to change one word in a sentence. In this case there were no lips moving for on-screen dialog, but the narration was really tight so I couldn't just punch the word, I had to re-record the sentence - and it
had to fit the existing "flow."
When I recorded the overdub it sort of fit into the right amount of time, but using ctrl-drag to fit the time didn't mimic the flow. VocalSync was able to duplicate the phrasing, and you really couldn't tell that I had dropped the line in. I had allotted 15 minutes to do the edit, but got it done in five.
I suspect VocalSync is the kind of feature where a year from now, someone will post "So I found this new use for VocalSync today..."