Single Window Menu screen in Nexus 5
Currently on the nexus-5 stock launcher the 'Google Experience Launcher' or 'GEL' for short, there is no way to customise the app picker / app drawer. You could install a free third party launcher such as Nova Launcher which I have checked and it has a 'List' option, or Apex Launcher 

The potential downside to a third party launcher is you will lose the Google Now integration on the left most homescreen and the Ok google functionality.