This is what I've been telling everyone! Only I've been calling it a "swoop", e.g. http://channel9.msdn.com/Series/Windows-8-Tips/Windows-8-Tips-2-Charms
The "shortcut" I think is most important to know for the charms is that you don't really have to "hover" in the corner and wait for them to appear before moving up/down to the one you want. It works much better if instead you "swoop around the corner" in one continuous motion. This is not only faster, but also feels nicer and is more reliable because the momentum from moving to the corner will continue and prevent you from falling out of the edge.
(btw, Search works the same, but from the upper right corner)