This is true as well. Here, there are some jobs that many people havee the same duties, so there are several ppl who can just jump in at the drop of a hat and help out or train the new person. My job is not one of those. Even my boss can only do a small part of the job I do bc I do things for several different areas. I also do admissions, so everything clerical starts with me, and then gets handed on to others. I am the only one who does admissions, so I have a person who is specifically trained as my back up person to be able to cover a vacation or illness. But there are lots of little things I do for other areas that aren't things that person is trained on. So in this particular job, it's helpful to have the person leaving the job be able to help the new person start. Or at the very least leave a comprehensive set of instructions or job duties so there is a starting place. I was fortunate that when I started the person who had this job before me is still here, just in a different area now, so she's always been here to answer questions. In the case here, there is no question that the program assistant will pick up all the clerical duties when any other clerical person in the program quits. As the program assistant, if I put in my notice, my boss would have me walk someone thru my duties before I left likely.I tend to think it's much more about what your job role is rather than a workplace culture.
None of the jobs I have held was I handing work to other employees, we didn't have that structure. My husband leaving his job it wasn't his place to just decide to hand off work to someone because the project leader was the one who determined who the work was going to sometimes they pulled someone completely new in. People were pulled off a project in a moment's notice too it happens. Even if you gave 1 day's notice you still can't just hand off work to someone because you don't know if that's what their role will be taking on what were your tasks. It's def. stressful picking up someone else's work though.
Professionalism typically dictates a 2 week notice but only in workplaces where shared work such that you're talking about exists should really any employee think about other employees like that. You could be the best of friends with someone but at the end of the day it's really your business that you're leaving. If you tell your immediate boss it should really be them who figures out the rest.