Agreed on the point that people will become busier. It’s the Jevons Paradox in its purest form: increasing the efficiency of a resource leads not to saving it, but to increasing its consumption.
We used to skip building internal tools or complex integrations because it was expensive, now it's cheap so naturally the business wants everything. Future engineers won't be writing code so much as orchestrating the chaos generated by agents. We won't stop working, but the workload is definitely going up