I know how to use it in the sense that everyone knows how, the basic usage is drag-and-drop. I just have no interest in spending a large chunk of my day dragging-and-dropping if it can be avoided (through automation, templating, shortcuts etc).

When you prepare slides several times a year you can get by with the usual method, when it's weekly I would rather spend a couple of hours upfront learning the software inside out. I thought this would be apparent to HN users from the OP.