What are all the tiny features on this microchip?
The logic input and output pads have rather large adjacent "interdigitated" structures which form the ESD protection. The pads with very narrow traces are the inputs (which require virtually no current, and the pads with the very wide structures are the outputs (which drive many milliAmps).

It is true that you can implement a simple gate like that with a very few transistors. But the internal circuit diagram that is provided for most integrated circuits is only an "equivalent" or even "simplified" circuit. When designing integrated circuits, the economies of circuit design decisions are different than when constructing equivalent circuits with discrete components.

If you follow the inputs from the bond-pads into the main circuit, it looks like there are several transistors and resistors just for each of the inputs. And even diodes and capacitors deployed along with additional transistors and resistors through the rest of the circuit and back out to the output drivers.