I've had PSE 3, 4 and now 6, and the reason I got ACDSee to organize (first tried Picasa however), is because it's an easier, faster, user-friendly, organizer.  If you download a free, trial version of ACDSee, you'll see what I mean (30 day trial).  I had the same questions but not after I tried it.  However, you could also download Picasa, which is totally free, and see if you think that organizer is easier but Picasa doesn't have nearly the features that ACDSee does...  I guess it's a matter of preference?