I can see this both ways.

On the side of the client who drives by a therapist's house, they probably feel cut out of the lives of someone close to them and are yearning for some connection.

I don't think the emotional toll therapy takes on the client is ever really fully expressed. Therapy is *hard*. Especially for people with attachment issues. If you're a client who isn't really that emotionally invested, or whose issues don't revolve around attachment, then yeah, it would seem weird to even have the desire to drive past a therapist's house, but if you're a client who has had a dependency fostered, it's pretty understandable, though probably fairly ill-advised.

It's a neverending irony that people who have emotional problems go through a process which I honestly believe would take even the most emotionally stable person and turn them inside out. For clients whose therapist is one of the closest people to them in the world, having the therapist not actually be part of their lives (or rather, not being able to be part of their therapist's life) is both strange and painful. I'm not at all surprised that people would indulge in all kinds of weirdness to try to assuage that pain.

I think a therapist probably has some responsibility to realize when they're deliberately fostering a connection which will be painful to a client. I think a therapist should realize when a client is starting to go down a path which maybe starts with driving by once in a while and ends up with the therapist finding the client sitting in their breakfast nook eating cereal one morning. (Which I am not saying anyone here would do, but I bet it has happened.)

On the side of the therapist, if I were one, no, I wouldn't be super pleased to have clients driving by my house if they had the intention of breaching the boundaries of therapy, but then again, I wouldn't be a therapist because I don't think it's very fair to take people with emotional issues, foster dependency, and then punish them when they act it out. I think therapy itself, while often helpful, is also flawed. And I think clients bear the brunt of the flaws.

Unfortunately, this is one of those situations where if the therapist does flip out and impose emotional sanctions or terminate therapy entirely, then they will appear in the eyes of the world to have behaved rationally, after all who wants a stalker? And some therapists probably do frame finding their adress and driving by their house a form of stalking. If they've been stalked before, they're probably going to come down very hard on that kind of behavior.

Ultimately, I don't think the urge to drive by a therapist's house is simple curiosity in most cases. (Unless you happen to be the sort of person who also drives by your dentist's house and your carpenter's house, etc, etc.) I think it's a sign that the client is feeling shut out and is trying to feel some kind of comfort and closeness. And I think that behavior probably exists on a spectrum ranging from completely benign and harmless to potentially dangerous.