Yea, everyone is right.
It refreshes the album info, adds new pictures and biography to artists that you have on your Zune, and checks play counts and other info which is then updated onto your ZuneCard/profile.
There is no way of turning this off, and as it does take a little while I can understand its going to get a little annoying. Maybe syncing more often will minimize the waiting time.
If you have any other questions, please PM me.
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