'I am inclined to think that RS teachers have it relatively easy (having to teach all pupils withstanding) because their examination classes are very straightforward - here are the stock answers so learn them.' Absolute rubbish - we do not know which questions will come up on the paper, and there are no 'stock' answers ime as a senior examiner in RE.
As an RE teacher (KS3,4 and 5) I also taught KS3 Geography, History and Citizenship and had to write Schemes of Work for the latter. I taught in excess of 600 students per week, so you can imagine my load when it came to reports/parents evening, planning, marking etc. I also used to do 4 after schools a week for no pay; G&T, RE revision, and two nights a week full course, for Year 9 on one night, and Years 10/11 on the Friday.
For those uninitiated amongst you, the KS3 RE syllabus also changes every 5 years as the SACRE produce a new one. They could decide to completely change the religions taught, so that one has to get new books, create and differentiate new resources, swot up on the altered religions.
One English colleague was shocked when I moaned about having to write 210 Year 7 reports; she had to write 60 (her Year 7 class and her tutor group). I had to do 2 year 7 Geog, 2 Year 7 History, 2 Year 7 RE, and my tutor group. That was standard for most Year groups - sometimes I got away with only 90, but that was good. Copying and pasting were not encouraged either, and my HoD for RE insisted on at least 7 lines, with set issues in each report.