ha ha, I've stayed out of this one because it's fairly obvious where I stand on the question.....but here's my view anyway.
A good DJ will use the mic to his advantage, personally I think it's an essential piece of kit when you 'work the floor'. You can easily just play records when the floor is busy, or if you don't care whether the floor is busy or not, but I'm firmly in the camp of believing people want to dance and have a good time, and be entertained. That's what they have paid their money on the door for. so if using the mic helps create that atmosphere, helps fill the dancefloor, and aids you as a DJ to fill the dancefloor it's a must. I also use the mic on very, very rare occasions to take the piss out of mates
On the even rarer occasion that I cock up behind the decks I also use the mic to take the piss out of myself but some people can waffle on too much, and I certainly try to avoid doing that because I know it can spoil the flow of a set.
It is though, a personal choice, and I've heard some great sets from people who never pick the mic up, that's just not my style though.
And I do agree that it is the most scary part of DJing when you first start out.
Cough sweets, I don't need cough sweets, I just need plenty of beer !