That's because the inside of the fridge gets to a preset temp, (around 5C), and so does the air trapped in there, along with the non heat producing food.
The reason you get condensation form ice on the cooling plate part, is because its much lower than the temp of the air and food in the fridge part. The dew point equation has just be moved lower down the temp scale. It's possibly reduced like you say by the fact a fridge is sealed and insulated for greater efficiency.
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"If you make relatively air tight case with a small plate or block as the first part of the wc-loop then the same thing will happen. The humidity will condense at the plate instead of the cpu waterblock since the plate is coldest."
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Admittedly I haven't got an air tight case, but I just don't think this would happen. You'd get more condensation on a colder part yes... but if other parts were below dew point, they will also form condensation too. I can't see it magically avoid those parts and divert somewhere else because it's colder.