I think it depends on what exactly you feel towards your T. If it really IS just reflection of past experiences (I "loved" my T because he was giving me what I missed in my marriage - empathy and no judgement), this will end when you realize these things.
However, my T recently moved from the city and senf me only a note by email... no "take care" or something like that. Now I would like to tell him something unpleasant and I don't think it IS transference at all...