I come from the other end as someone who decants a lot- we drink a lot of wines that open up a lot faster by decanting. Different wines decant differently- for example, we never decant pinot noirs or pinot noir based wines as it presents the problem dicksond noted.
There are a lot of wines, especially older CA cabs and Bordeauxs that open really nicely if decanted properly.
In regards to decanting white wines, white burgundies and heavily aged white dessert wines get some help in opening up by decanting, but frankly for white dessert wines i'd just pick my wine at the beginning of a meal and open it then. i guarantee that by the end of the meal it will be ready to pour, just as it would with a decanted (if it's a decently long meal).
is making all his reservations under the name Steve Plotnicki from now on.