As much as it might be something I'd sometimes like to hear, it would really derail me and create a very unhelpful tone, no matter how platonic it's intended. Fortunately, I can't imagine my T telling me that, even if she actually felt it. While I actually believe (non-romantic) love is an important component of therapy, verbalizing it might feel like a boundary violation.

Though, when we've done all the work we can do together, and we're saying goodbye, hearing her say it would be a lovely gift.