I would think it different for therapists because people have more than one or two appointments a year - I think it is somewhat usual for people to have weekly appointments with a therapist over a period of time. For me, as an attorney, people do not see me weekly for long periods of time. I don't see my dentist weekly either. So taking time off for those things is a rarer situation.
Plus I never worked just 9-5 as an attorney either.