Chemnitz --
You are Lutheran, right?
You do know, don't you, that Luther retained a
profound Marian veneration all the days of his life, right?
As for your statement regarding the elevation of the Theotokos -- this is something that I had to deal with when I came into the Orthodox Catholic Church. Providentially, I came to the answer rather quickly and had less problems with this than with other issues.
Remember, the redemptive work of Christ was done so that the physical creation could be redeemed. If you go back and study the small amount of information we have on the first family of mankind, we see some interesting things. Adam and Eve were given authority over the earth and told to subdue it.
Now suppose that Adam came out of where ever he spent the night and seeing a cloud in the sky, decided that he would like to have a day without clouds and said "Cloud -- gone!" Remember, because he was bearing God's authority in him, what he said would happen.
Would Adam be usurping God's authority or acting in it? I think you know the answer.
Well, in the same vein, the Blessed Virgin is the new Eve of the restored Garden Covenant. Remember, Christ came to die that all which was destroyed in the Garden be restored. Thus, He bears the name of "the Last Adam". Jesus, as perfect humanity, restores the covenantal headship of Adam. But for this to be complete, He must also restore Eve or the physical and earthly aspect of the redemption is not complete.
So we have Jesus and the Blessed Virgin who are tne Last Adam and the New Eve. They are the new covenantal headship over the human race. They have taken the place of Adam and Eve, who, had they not sinned, would have been king and queen over their children -- all mankind. And they would have had authority.
The authority which the Blessed Virgin has is therefore the authority She bears in ONENESS with Christ. She does not bear this authority outside of herself or by herself. She is to mankind what Eve would have been if the Fall had not occurred -- Mother of all and bearer of the authority of the one who is head of the covenant.
Let me give you the smallest picture I can of this: the nuclear family. In the traditional family operating along Judeo-Christian ethic of the family (in other words, not some feminazi perversion of the family) the father is the head. He is the authority and ultimately, his word is the LAW. The mother operates as ONE with him (remember the "one flesh" relationship of marriage?). As such, she gives orders also to everyone in the household but the father.
Can you imagine for a second some sprout of a child telling his mother "You're not the boss and you cannot order me around."
WOW!! There would be flamin' hell on that kid's backside that evening, I garantee you that!!!

And why? Because to sass the mother bearing her authority is to sass the father who gives it to her by virtue of their oneness.
I think that one of the problems which accompanies Marian devotions is that the statements of honor to Our Lady are not necessarily accompanied by an explanation which says what I have said above. Therefore, those non-Catholic and Orthodox who hear us think that we are honoring the Blessed Virgin alone for what She is intrinsically outside of Christ! Nothing is further from the truth. It also doesn't help that Catholics and Orthodox cannot explain these principles of covenantal headship and authority better when they speak of the Blessed Virgin.
BTW -- Just for you curiousity, today is the celebration of the Protection of the Mother of God. History records that almost 1000 years ago in Constantinople, the Tartars were "at the gates" so to speak. The city was in great alarm and great prayer was made for protection. In response to this prayer, the Blessed Virgin appeared over the city and spread above the city her blue mantle of protection. The invaders were destroyed (by a storm of fierce magnitude if I remember all correctly) and the city and the believers therein were spared from certain death and destruction. The Orthodox Church has continued to celebrate this deliverance every year since then.
Cordially in Christ,
Brother Ed