People who are collecting and organizing dozens or literally hundreds of citations--such as students working on a senior thesis, graduate students working on dissertations, and professors writing books or journal articles for peer-review--often use citation management programs.
If you only need to format 5-10 citations for your project, these programs may not be worth the time it takes to learn to use them - but if you are curious, by all means, check them out and see what they're about!
