I start my morning by checking my email and RSS reader. Then, I'm off to the forums. Next, I check on social media (Facebook, Twitter, etc.) That's at least 10 different websites in the first hour of my day.
I could remember what I need to check, memorize the URLs, and type them in every morning. Or, I could bookmark the websites I need to visit and organize them for efficiency.
There are still some people who rely on their browsers, be it Internet Explorer, Firefox, or another, to manage their bookmarks, but I believe that most have turned to external bookmark managers, online or off.