Now, I'm not an expert, but I just don't get the principle.

I have a single speaker output on the amp, and two speaker inputs on the speaker.

I can connect two pairs of wires, bridging the two at the amp, and connecting them individually to the speaker input. Or, I could bridge the two pairs of wires any place along the length, and it would give the same result, until I finally reach the speakers themselves.

So isn't "biwiring" pretty much the same as running double-size cables from amp to speakers?

This is different from bi-amping, since with that, there's a crossover at signal level where different frequencies run at different amps.

Right?