Basically the very first part from your list: Remembering context. Working with people means that a lot of what I'm observing or what is happening will happen at a later stage. It tremendously helps to go back a few months and dig up my notes from back than, either to connect the dots to a development or reduce the "he said, she said" - dance that happens way too often.

I also like that fact that I can just scroll down a long list of entries, when I'm not sure about the exact words I used in this situation to note something down, or when I just remember the rough timeframe something happened.