Not usually, but I do get mildly verbal.
Sometimes when I am jerking off, and the mood hits me, I'll get verbal towards the end of my edging session and it seems to really add a lot to my orgasm. I think mostly it is because that's a rarity for me, so in a way it is a spicy little naughtiness. When that happens, I'll also verbalize something, almost like a confession, that I want to suck a friend off-- like he is there and I am saying it to him personally.
When I am having sex, I like to verbalize that I am about to cum. I think that's particularly hot, and I get the same added arousal as when I am bating. It's just an added element.
But as for pure grunting.. I don't really do that. I find some people mimic what they see in porn, and feel that it is generally overdone.