I'm surprised more contestants don't use more strategy. It seems foolish.
It seems obvious that if you want a Daily Double don't pick the first row. Yet so few players ump right to the higher valued questions.
I caught a bit of an NPR show which had some interview snippets from Arthur Chu. He's clearly thought this out.
In particular was the realization that making decisions under pressure would be sub-optimal, so he worked out in advance what to do under various circumstances (tight game or big lead, early/late in the game, etc) and sticks to the plan.