I've told my Pdoc that his boundaries, and having those boundaries, and knowing they are in place makes me feel safe as well. I feel safe because I know I can open up to him, and place 100% of my trust in him and he will never abuse that position of trust.
After being previously abused by a Pdoc, those boundaries to me are almost freeing in a way, because I know my Pdoc abides by them, and I know he has a strong ethical sense - so I can allow myself to trust and be open. I know that trust and openness isn't going to be used against me, or used to manipulate me for his own advantages.
Boundaries to me don't feel like limitations, they feel like they give me a safe space to be unrestricted within the confines of a therapeutic relationship.