The history of the Iconostasis is long and arduous. But in answer to your question, there is still a barrier between us and God--sin. The Holy Doors are open at appropriate moments of Vespers, Orthros, the Hours and Divine Liturgy indicating God's coming to us and saving us through His incarnation, death and Resurrection but we are still separated by our sinfulness. Nonetheless, there is hope.
Not to get off topic right away, but I don't know if the development of the iconostasis (which really came into its place around the 14th century) has ever been discussed though in terms of the Palamas distinction of energies vs. essence. I'd be interested if it has been.