I use several different computers and operating systems regularly, and it's really useful to have my browser history, bookmarks, extensions and other configuration synced up.
That's not to say I'd be miserable without it, but it's a nice convenience that almost immediately upon starting up a new machine, my browser is set up exactly the way I like just logging in.
That's not to say I'd be miserable without it, but it's a nice convenience that almost immediately upon starting up a new machine, my browser is set up exactly the way I like just logging in.