Transistors have some capacitance and making them smaller makes the capacitance smaller, which makes them faster. When you want capacitance, the the bigger you make it, the more capacitance you get.
Integrated circuits (computer chips) that do analog things use small capacitors frequently. They tend to use more chip area than transistors. The worst offender are ~~instructors~~ inductors, so you really try to make an integrated circuit design not need any of those.
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