The mystics are onto something. There is another plane to this life, something more than we can see, more than we can fully understand. I think it is right and good to embrace and be shaped by that mystery.
But even so, we must be careful to avoid platonizing Christian devotion. There is no high life or low life. The goal of my devotion is not to escape this world for some mystical union. Rather, the goal is to see and show God in every aspect of my everyday life.