Golly jingl- they do, they always have...They also have to run a 'business' The Practice, and staff, admin, buildings, etc, etc, etc. Many also teach and mentor younger GPs, and they also have to do insurance reports (the bane of their life- always done at home at week-ends or nights off) and write reports on students and registrars, prepare lessons, mark very complicated essays, have school and industrial appointments, do funeral and incineration paperwork, etc, etc, etc, etc.
Did you really think they would just do the surgery appointments and go home to put their feet up? Even at end of career DH rarely worked less than 70 hours per week- and much much more when younger (up to .... 140- believe me or not).