How much training does it actually take to learn the GNOME 3 interface though? I use to train people at a call center how to use an old terminal based DOS application to fill out orders for sausage in 3 8-hour days. But gnome 3 is a lot more simple. Surely 8 hours is enough to teach about work spaces and how to press the windows key?

It's funny you almost never hear about companies having to train staff to use a company smartphone. I guess all smart phone interfaces are pretty similar though.