But I have many polling booths in walking distance from where I live. Basically every school is a polling booth for the occasion. So the size of the electoral districts is irrelevant, the breakdown is into what we call wards which are tiny. And are that size (or smaler in rural areas) throughout the country no matter how densely populated the area is.
So, sure the largest vote I take part in is a referendum or presidential election where the entire population vote on one issue, whereas the smallest is in local government elections where mere thousands vote on a candidate, but my voting ward stays the same size - several thousand people voting in a school in walking distance from all of them - whether I’m voting in the European Parliament election (district of millions) or my local council (district of thousands).
And that’s why there are never any queues.