Goodness OP it's barely mid-October - too soon to conclude that your DC's entire uni life will look like what it is now!
The first term is about settling in and finding their feet, first year about building the basic foundation for the next few years. The workload ramps up exponentially in second year.
Also, a humanities degree has a heavy workload with all the additional readings, some people don't do it then regret it come exam time but that's their own fault, not the course's. Less 'hands on' in STEM doesn't mean easier.
In second and third year alongside their degree they should be exploring careers, getting work experience (running clubs and volunteering count as well). Employers these days won't hire graduates who have done nothing but study, they'll fail all the competency based questions for a start.
Your DC days will be packed, truly.
Also never underestimate the importance of getting to know other students especially for a degree without a set career path. I got put onto mine by a senior and advice from people who have been through the recruitment process, already worked in certain firms etc can be invaluable. All these people are good professional contacts and it's worth maintaining relationships.
We're told, throughout school to pass exams and it's all that matters but the world of work is about who you know. Really. Yes I needed my intellectual skills but it was my networking that has helped me greatly, the confidence to build relationships with new people, get their insights, etc. I was a shy girl and would never have had the balls to ask, ask, ask (and get!) if uni hadn't forced me out of my shell.
Of course I am not saying to waste all your time partying, there must be a balance, but really as long as you get decent grades. Getting the 'top' grades are useless unless you want to be an academic.