I used to work regularly on a commuter train with a firm-provided touchscreen ThinkPad. The touchscreen was great on the train because it was faster (for many things) than reaching for the trackpad. And when you're in a sort of cramped sitting position, reaching forward feels natural.

I'm a lawyer by trade and am forced to lean on GUIs with little keyboard-control support. When I code (for pleasure), I don't miss the touchscreen, but I often miss it when I'm trying to read PDFs and Word documents on the go.