How come? It seems it is very analogous to water in a pipe. Let's say I have a 30 m long garden hose. The water in it moves (in the order of magnitude of) 10 m/s in it. If the water is turned off, and I hold my thumb at the end of the hose and turn the tap on, I feel the water pressure almost immediately (the speed of mechanical waves in water). So it is obvious that there are two speeds. One is the speed of propagation and one is the speed of the medium, and they are way different.

All models are wrong, some are useful.

If you go on to study electronics / electricity beyond junior schooling level, you’re going to be exposed to progressively less wrong models.

Or watch three YouTube videos, there was some action from the big guns a couple years ago.