Yes, this is exactly what I was fighting against.

If I have three classes that interact with "MyTable", then I can grep for places that interact with "MyTable" and I get back three classes.

After refactoring, the class which now knows about "MyTable" is Constants.java, which has no business knowing about "MyTable". Grepping it now turns up a false-positive and finds 0 of the actual usage sites (3 false-negatives).