I don't really know any OP PTs who go by Dr. Last Name, although my exposure is somewhat limited. That being said, I am about to start work in an OP clinic and will not require my patients to refer to me as Dr. Last Name. I'd prefer to be a little more personal with patients and have them call me by my first name; plus the other therapists also go by their first names, so I don't want to be called Dr when the clinic director who has 18 years of experience goes by her first name. That being said, perhaps if I was in a setting where the other therapists were already being called Dr. Last Name, I would follow suit. I'm definitely proud of it and my family and friends have been calling me Dr. First Name since I graduated! 😉