Although I have had occasion to use noggs this has mainly been where joists are sat on a wall plate. To add stability I secure the nogg between the joists on the plate. Given the constitution of a correctly assembled decking structure it is very rare as long as you stay within the correct parameters as Karl pointed out and use quality graded timbers that noggs would be required. I tend to agree with Karl on all points it has to be down to personal choice and confidence in your own structures.
Leon