[15155]

Voltage dividers are still commonly used in MCU-laden designs, as are RC timing circuits.

(The power supply sitting next to that MCU has a divider-based feedback loop, usually.)

These possibly can't be learned from a wiki, but they can absolutely be learned from the Art of Electronics for a low price.

[wkjagt]

A potentiometer is a simple voltage divider, and I think often used as an input to the ADC of an MCU, as a means of turning some some value up or down.