Almost everything. I work in digitization in the public sector and there are almost no business processes which can't be improved or turned into a self-service with minimum supervision and we've been doing it for a while now.
The reason it has been going on without anyone really noticing is because very few people get fired because of it. The real effect has been on a slow down in new hires as people retire.
The reason for this is that whatever efficiency you free up isn't directly tied to a single job function. Say you do a self-service system for handling employee transport costs. This might free up an entire job function worth of hours in a HR department, but they are coming from 6 different employees. Doesn't lead to anyone being fired, but eventually you'll automate enough systems that someone retiring won't need to be replaced.
Programming isn't even a safe zone. I mean, think about how much time you save by using things like modern frameworks and the interconnectivity of everything and then compare that to how it was 25 years ago.