I definitely find the importance of what I'm working on sets my productivity, and when I say importance, I mean to me. Tasks such as beer brewing, where things need to happen on a certain timeline otherwise a bad batch is produced, I tend to be very productive because the end result is very important to me. A task at work however, especially with an arbitrary time line, doesn't rank very highly to me for importance (even if it's important for others), so I tend to be less productive working on the task.