We have a plethora of hummingbirds that visit our flowerbed in front of our house too. And like azwildcat96, they're usually dive-bombing us. It's very interesting to watch their interactions. They seem to be very territorial, and will chase each other away from the food source. A couple of the more dominant ones will hang out in nearby tree limbs to ambush the others.

And then they do a mating dance where one of them goes back and forth in front of the other very fast, making a sort of whistle sound with his wings.

I've had them hover within arm's reach of me, but never close enough to feel the wind from his wings on my face. That must have been weird! I know what you mean about the disturbing feeling being near them. I think it's the sound that they make: it sounds like a huge insect, and our instinct tells us to be alarmed.