It depends. If all I need to do is relieve some stress, my orgasms can be just a matter of breathing hard for a few moments and feeling like I've run a 100-yd dash, and my cock isn't very sensitive afterward. This is usually the way it is when I'm jacking off every morning just as a habit.
But if it's been a few days or if I'm with my lover, I've been known to shout, moan, tense my whole body, tremble all over, shoot across the room (or hit myself in the face), pass out for a moment, and then lie there like an old dog sleeping in the sun while my body slowly desensitizes and calms down. That's like coming down from a triathlon.
One thing in common, though, no matter how strong my orgasm is or isn't: My knees get weak when I come. When I'm jacking off, I can sometimes manage to stand up, if there's something soft that will save my knees when I inevitably drop to my knees at the climactic moment. (This is one reason I can't jack off in the shower: The tub is too damned hard on my knees!) But if I'm with my lover, I tend to collapse onto the nearest flat surface and stay there for a while. We've learned to make it to the bed, even if things are going "spontaneously," because of this.
Definitely no driving while coming.
NCbear