What a bunch of great responces - really! Starting with #'s 3 and 4 there were some qualified "Not so great" opinions.
Let me see if I can make some sense out of what seems to be a "major difference of opinion", or at least what seems to be a bad reflection on molasses.
1. Adding molasses to a "mediocre" performing soil can have the appearence of tuning it up to a "good" performer, primarily by feeding the "micro-herd".
2. Adding molasses to an already "good" performing soil may improve the soil's performence to some degree - but any improvement would be less drastic (and therefore, less noticable).
3. Adding molasses to a truely excellent soil may not have any readily noticeable effect at all (at least, not for a while, perhaps not at all!). But like bigv already said "It can't hurt!".
So, I say this, "People who use really good soil probably wont appreciate molasses as much as people who use crappy soil". That's about all there is to it!