In order to add an mp3 onto my iPhone I need to: start up iTunes and wait for it to load; plug in my iPhone to my iMac; find the song and drag and drop it into iTunes; click on Sync, and then wait for Sync to finish everything. If I haven't synced my iPhone in a while, then it could take 10+ minutes, since it has to backup, copy new Applications, etc.

What it should be is: plug my iPhone into my Mac; my iPhone should show up in Finder or on the Desktop; Find my mp3 and drag and drop it onto my iPhone icon; unplug my iPhone. I have no idea why I need to interact with iTunes at all.