I have a hard time seeing that. In fact, after having worked with the Right Use of Will books for a number of years, I would tend to disagree and see a potential misunderstanding. In fact, God suggests in those books that we love and accept our fears, that we give them expression so they can evolve, and that they have a purpose and a teaching. If we say that fear is the opposite of love, then we are putting fear outside of love, which seems to contradict those teachings. It seems to me that thinking that fear is the opposite of love would create an attitude that disconnects us from what the fears can teach us.
Fear seems to be the opposite of love because it began with an experience of unloving light.
The Mother contracted when she felt the pain of the dismissive light I unconsciously sent her in the beginning. She did this in an instinctual attempt to prevent the pain of my displeasure from entering and hurting her more deeply. Because love is characterized by expansion and fear by contraction, it's easy to see how fear can be misunderstood as love's opposite. You're right in not disconnecting from the fear, and experiencing it has an important role in healing. You have discovered that fear is a powerful teacher.