The simple ugly answer is improve your microphone technique. Mostly de-essers, gates, editing effects, EQ, and the rest of the plethora of electronic hooey will not sound as good as a singer who doesn't pop his plosives. Simple but difficult answer- don't beathe audibly. If you can hear yourself breathe, so can the mic.
If it's cardioid, be off axis when you breathe. Find the phrasing pauses in the music to take more small breaths and control the sound you make. It's weird that when these issues come up, almost everyone on this board will start suggesting their cool electronic solutions to bad noises, when the obvious answer is not to make any!-Richie