I like files. I like editing a CSS file without necessarily having to edit an HTML file. I like fixing a problem by replacing a corrupted file with a clean one. Maybe I'm set in my ways, but I don't consider it a hardship to open a folder or replace a file.
To my way of thinking, passive management of file assets is okay for screwing around with iPads, where we're mainly watching TV on Netflix or obsessive-compulsively checking the popularity of our Instagram uploads.
Dropbox sweats the user experience details as commendably as it masters the considerable engineering challenges required to reliably sync files everywhere a user may need them.