You might be forgetting them, it's literally just a line with numbers marked on it. I learned them in primary school in the 90s, further classes never used them but they've always been useful tools for visualizing relationships between numbers.
Usually just when I am having trouble with an idosyncratic number scale. So usually when I need to make sense of dates and the time between them. It's often got nothing to do with work, but I do use them in my personal life.
