I enjoy and appreciate your posts as they are usually quite informative and extremely practical, so I am loathe to disagree with you. In this case, I think you are thinking about this incorrectly.
If the system is a true closed loop, you are not pumping water up from the depths as in a drinking water well, you are moving water around a wheel. That is, every gallon coming up is counterbalanced by a gallon going down. The only head the pump has to overcome is the frictional resistance in the pipe, not the height of the column.
In my area (NW IL) I have seen geothermal systems both drilled and trenched, usually decided by the subsurface conditions. On my property, I think it would be difficult to dig 600' of trench 6' deep without dealing with large rock formations.
As to pressurizing the system, I think that pressurization of any hydronic system is a really good idea largely because it makes oxygen much less of a factor in system wear.
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