For me, this issue is based on the degree of the invasive behavior. Driving by someone's house because you want to see where the person lives and what their house looks like is pretty tame and non-creepy in my book. I've never felt that curiosity, but I do understand it. I don't think a person has to "report" to their therapist their curiosity unless they feel distress or discomfort about their urge to see where their therapist lives. If he/she is driving by or have uncomfortable urges to drive by on a regular basis, then it's probably time to talk to his/her therapist.

If the person parked outside the house and set up surveillance (cup of coffee, binoculars, ducking down in the seat whenever anyone came out ), I be a bit creeped out. If I had kids and they were coming in and out of the house, I think I'd call the police and have them check the person out. It's a crazy world out there. If the person sat in the car and then got out of their car and came up and approached me whenever I came out of the house or rang the door bell and expected to come in and "chat" (after perhaps doing this once and being told that wasn't appropriate), I would tell them their behavior was waaaaaaay out of line and I'd call the police if they continued to trespass. The sad thing is that on rare occasions, therapists, other professionals and former lovers/friends have been stalked been someone they know and it wasn't just innocent curiosity. It can be deadly in some rare cases. You can't be too careful. But, OP, the kind of stuff you're talking about in your post, doesn't come up to this level of invasion and I really think you get to decide if you want to talk about it with your therapist or not. Either decision is perfectly okay.