The problem with 'loving' a therapist is that even what you do know about him is only a fraction of the story. There's also the fact that the therapeutic relationship is designed so the client gets all the support and has to do no work for the therapist. The therapist must always be in a therapeutic frame of mind, have positive, unconditional regard, etc.

Who wouldn't love someone who appeared that way?

But the thing is, real love is when you pick someone up from the airport at 2 am and they're grumpy and they snap about wanting noodles and then they fart and it's all gross and you drive them home and make sympathetic noises while they finally get something to eat and spend an hour talking about how horrible their boss was on that business trip. Real love is when you still love someone even when it's all about them sometimes. And therapy is never, ever, all about the therapist. So how would you know?

That's not the same as the self disclosure you claim is the same as knowing someone. It's one thing for someone to say 'I don't like flying'. It's quite different to have been the one coaxing them onto the plane and holding their hand for a flight. Clients are never there for their therapists, so any love they feel is idealized.

The only kind of love a client can really feel is an infantile regression of love for a caretaker figure (because that is the only role a therapist can hope to be realistically cast in, and even then, it's a bit of a stretch.) That isn't adult love. That's desire, and yearning and longing, but it's not the sort of love that real romance is based on.

I also think it's kind of dangerous to confuse having one's needs tended to without the need for reciprocation as some kind of ideal love state. Because that's not what happens in real relationships, and if you try to measure real relationships against therapy, you're going to have a bad time.