I'm working on a very niche sports scoring app and designed it to have nice, clickable buttons. But when trying it out in the field one of the officials had a touch-screen laptop, and it was pretty nice for clicking/tapping to enter finishers of a race in order. So much so that I reworked the rest of the UI to allow for touch.

It's not a tablet-doable thing, really, and I don't really want to take the effort to get it in an app store. But adding touch-able buttons made it a bit nicer UI overall, so I'm glad I did it. Now this person, and anyone else, can also use it with a touch screen if so desired.