I am relatively sure that you could tell that my keyboard is primarily used for coding C# in Visual Studio just by looking at which keys are the most worn and w

I am relatively sure that you could tell that my keyboard is primarily used for coding C# in Visual Studio just by looking at which keys are the most worn and which carry a significant layer of dust on them. The keys that complete an Intellisense selection (space, period, semi-colon, Enter) are nearly ground down to nubs, and the open-paren and open-bracket keys are worn smooth, while the corresponding close keys indicate near complete disuse. Similarly for F5 (Start Debugger) and F10 (Step Over) compared to the rest of the F-keys.