Diagramming conditional statements...helpful or not?

[HaciM36]

For those people who have attempted or currently do diagram conditional statements and contrapositives, do you find this technique to be helpful or more time consuming than necessary?
Ex.

If you hit a glass with a hammer, the glass will break.  H -> B.
And the contropositive : If the glass is not broke, it was not hit with a hammer. -B -> -H

I'm more concerened with writing these out for logical reasoning more than games but does anyone find these particularly/extremely helpful for either or?