Back in my school days at Emory University's library, I'd be busy about 30% of the time, except during mid-terms and finals when it was more like 90% of the time. I got paid $8.75 an hour, and I got to work with books.
From January to April this year, I worked at a grocery store and had no time at all to do anything but scan groceries. If it got slow, the best I could manage was having a piece of scratch paper and a pen to jot down ideas. I got paid $8 an hour, and sometimes had to work until midnight, or open at 6:45am.
Monday I start a new library job. I'm getting paid $11.37 an hour, and I get to sit at a desk. I honestly couldn't care less how busy I am, because I've been a grocery store clerk. A library job, where my hours are regular every week, and my evenings are always free, is phenomenal compared to that.