It's the nature of the job. You find strategies to deal with workload (or continue to enjoy working unnecessarily hard) and get on with it.
I have to say it's this dichotomy I disagree with.
I've been teaching for 18 years and up to a few years back, didn't use to work holidays...
But for me it is the demands of the course changes, and personally I find the insinuation that I just need to work more effectively / find better strategies really insulting. After 18 years, I do know what I'm doing!
However, my point is that for some the changes have had much greater impact than for others. For example, my colleagues who teach Sociology have been able to adapt their materials so the changes have had little impact on them. For me, I've got major new topics to learn and to write materials from scratch.
I also work somewhere where the standard teaching load is 27 hours a week. All A level teaching. There's little downtime in term time, so doing the planning now will keep me same term time. It is my strategy for reducing work term times.
I really can't see why it is so difficult to accept that teachers have different circumstances / different situations.
For me, I've got a tough 5 years, but once it's done, I will go back to not working holidays and weekends. But that does not negate the work I need to do now.
I would honestly say in 18 years of teaching, I would say now is the toughest I've had in terms of work load. But this is my work circumstances - I only teach exam classes (over 90% A level), Large classes (average of over 20 in a class) so lots of marking), a full time teaching timetable of 27 hours per week (although some of that for me is management) and having to implement major changes to my course. It's not just a case of tweaking lesson plans - it's majorly learning new scholars, new topics I've never studied or taught before and as I have already said, without any text books to guide me. As a small subject, I don't have the luxury of just buying a text book that has got the material pre published. I'm having to read the original texts (philosophy - so often very complex and several with a reading age of 21+) and turn that into a format that 16 year olds can understand.
It's not lack of strategies, or being a naive teacher... It's the demands of having major changes implemented at the last minute.