I’m sure your question is already well answered, but I saw this question before and was also intrigued. One of the top comments put it like this: let’s say it takes you one second to take a 1-foot step. Now scale that by 100. It’ll take 100 seconds to take a 100-foot step. That helped it make sense in my head.
It’s the cube-square law. Take Aeroplanes for an example. If you double their length in each dimension they are 2x2x2 larger and heavier and more power. The speed is determined by when the engine power is equal to air resistance, air resistance is given by cross-section times Velocity²(P=AV²). So power is 2³ times more, but cross-section is 2² so Velocity²=2 or Speed is only root 2 or only 1.41 instead of being twice as fast.
So if a plane is twice in length it is 8 times bigger but would only travel 1.41 times as fast.
Or if you want to go twice as fast you would need to be 4 times in length or 64 times larger.
Lots of folks missing the point I think you are making. A good example might be the antman movies, whenever he goes giant, for some reason they think it looks cooler to make his movements slow, plodding, and laborious. Which is a subjective choice and some might like it… But I personally think it looks ridiculous and there is *no* reason that it must be this way. Look at the neon Genesis evangelion movies as a counter example. They have similar scaled humanoid giants moving around and they give them a frightening sense of speed and scale not to mention *weight* without needing to rely of slow plodding movements.
This is 100% a choice that the folks making the media are making. And to me, it looks WAY better and more impactful for a giant to run around quickly as if you or I were running amok in a model train convention. (Don’t do this, those old guys are stronger than they look and take their miniatures seriously)
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