For the bulk solution perhaps, but there is always a boundary layer between the surface of wb or rad and the bulk water. At the surface (with proper resolution to see) the water should be fixed, in fact. Increased water velocity improves thermal transfer because it will decrease this layer. Increased water velocity also directly affects Reynolds number (the measure of turbulence). Hard to discern what block designs are improving performance due to increased surface area vs. actual changes in flow dynamics though.
#rotor your comments are as usual in line with mine. There are many block designs that would be extremely low flow and high resistance (Lytron?) that most likely will outperform these blocks that are "high flow" simply for the sake of bulk water movement.
On a somewhat related note, how costly is it to have you make waterblocks? I have the crude beginnings of a plan...
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