I'm sure all of you have noticed that at first install and at all updates Reader creates a desktop icon. Does ANYONE know a user who starts Reader and then opens a .pdf? I'm a network admin and of the hundreds of users I've observed, everyone double clicks the .pdf of interest. Perhaps olde DOS Word Perfect users? The only thing I can think of is that the marketing slime demand it. Comments.
If I'm only opening one then sure, I'd double click it. If I have to open multiple PDF's at once I would open Reader/Acrobat and use the File>Open menu.
I always open Adobe Reader from the desktop shortcut, then select one of the documents from the recent file list.
However, I believe there is an option using the Customization Wizard to not place a shortcut on the desktop. Never used it, as I like to have things handy on my desktop...