I've never done them. It's just a waste of a power rack, imho. Either that or my traps just grow like weeds, especially since I did my first cycle. But even when I'm sick and disheveled I've got "roid traps" just from doing rack deads.
I think people with no traps need to stop doing so much direct work and just stick with the basics. I tried everything in the book to grow mine and nothing worked. Then I stopped doing direct work and they grew, especially when I did proper rack deads and floor deads.