What are you talking about? In Expo I can navigate up and down using these keys. The workspaces are not in a row.
Ok, I give up. Maybe Unity, KDE, Xfce and MATE can help you. At least, I feel Cinnamon to be better and more customizable than GNOME 3. GNOME 3 only allows workspaces to be vertical, you know
Being a Windows user I'm not used to working with workspaces, so that doesn't matter anyway.