And I am literally a security engineer; the work has absolutely not gotten harder, it's just changing in how you think about security, just like it shifted before from "secure the perimeter" to "defense-in-depth", it's now changing again to focus on automated response and compartmentalization/ segmentation (and I mean real segmentation, not the checklist-style "we have 3 vlans, but they can all talk to each other" 'segmentation' you used to see.
Yes, everyone is rushing to implement zero-trust principles for real now. It's getting harder to trust that your public facing endpoints don't have vulnerabilities, and it's getting harder to trust that your internal software and endpoints haven't been compromised from within your pre-existing trust boundaries. A lot of the increased workload is due to patching up the existing security infrastructure, and on top of that, building out new solutions to better fit today's threat landscape.