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So even though the diffuser locks the flash at 14mm still use it at all times in doors?
Bruce only said he uses it all the time when he's bouncing off the walls/ceiling. I tend to do that as well. There isn't going to be anything you'll want to do "at all times", it's always going to depend on the situation. One of the great things about digital is the instant feedback, so as a learning exercise, you could find different situations to shoot in, and then take several shots: with the snap-on diffuser, with the pull-out diffuser, with the pullout and the bounce card, naked at 14mm, naked at 200mm, etc. That will help you understand how each behaves, and then you can apply that to situations in the future as you see fit, rather than try to just come up with a list of scenarios where you use X, Y, or Z.