For a PDoc (especially a kid PDoc), I don't see it as any different than any other medical appointment reminder. I get calls from my PCP and my GYN 24 hours in advance, as well as the Vet for the dogs (even if I scheduled an appointment for 48 hours out, I get the call the day before the appointment). I think in a more medical setting, where appointemnets are less frequent and regular, it makes sense. If my T (or her office) was calling me to remind me every week, I would be put off though.
Am I remembering correctly that your PDoc's also do weekly therapy? It would be weird to weekly be reminded of an appointment...