This is much more situational though.
For example, in that screenie, if WJ Settles in place on the Tobacco, sure, he'll then have 2 BGs to work -- but his capital also won't ever be able to use the Wheat we can see on the other side of the lake. Conversely, if he moves his Settler NE onto that BG tile (while his Worker begins mining and roading the Tobacco), the Wheat will become available to use 10T after Trondheim is founded. Given that "food is power" in Civ3, sacrificing 1 shield in the short term to gain 2 food for the rest of the game seems like a good tradeoff to me.
Looking at his position on the minimap, moving north would also place his capital that little bit further from the Tundra regions that are (for sure!) just out of sight to the south.