It's an intense rush. Feeling pleasure only, the world falling away from under you. It's like being displaced to another dimension. One so exquisite you'd care to stay forever, but the sheer force of ecstasy threatens to exhaust you into annihilation if you dared. You ride the waves until they are only small ripples of pleasure.
Oh, to be in the After state of mind every minute of every day! Who wouldn't want to have an existence of pure bliss? Utterly at peace in your mind and in your being. What life interjects would no longer be an issue because your response is one of not being affected... by any of it. Your inner peace rules how life is perceived.
If there is a utopia, I imagine it would look and feel just like that.