Time sheets. I'm not a fan of our task management system, you don't check out jobs or tasks like moving cards on a kanban board, it's more of a loose, calendar-based setup. We're also in a small, open office so it can be difficult to remember to log things in the software when you could tell the person opposite you that their task is finished. On top of that a lot of the time it takes me longer than the scheduled time to get a job finished as I'm learning a lot of new stuff, so digitally documenting things like that worry me a little. I don't want to look like I can't hack it just because a job takes me longer than my much-more-experienced colleagues.
I should note that I understand it's all incredibly useful data to the company, but I hate doing it and it's very easy to forget or ignore.