Avoid fines!

My public library has an online presence, which makes it easy to request interesting books as I run across them rather than keeping a list and going there in person. I’ve discovered another handy tool, too: I can look up and sort the books I have out by due date, rather than go to the pile and physically open each one. That makes it simple to find the ones I need to take back or renew (sadly, the online renewal function has been temporarily disabled).
So is that a clever use of the internet or merely another exhibition of sloth?