Once you are having these feelings, odds are the T and/or PDoc are trustworthy in your mind. If they've reached that point, it's good to let them know. They already know how important they are to you, but knowing you've reached that awareness, and trust them enough to feel that way, yes, they need to know that.

IMO, this is good. Another thing to think about: wouldn't you like to know how they will respond to this, before you share big stuff with them??? Plus, their understanding of this transference will help you share in the future.