QUOTE (jaskanski @ May 5 2009, 10:43 AM)

Casual water is a matter of fact. It is either there to see or is visible when you take your normal stance to play the ball. There is no in between soggy or muddy relief - it's either casual water or it's not. If it's not there, there is no relief. Mud is not casual water and you do not get relief from casual water by placing the ball either. Placing is a local rule that may be invoked by the committee or tournament officials during social or competative rounds. If in doubt, play it as it lies.
This is a great summary of the casual water rule.
The OP said he knows the rule and asked if anybody improves their lies. I think the answer is yes, many people improve their lies and not just because it is muddy or wet. I know of some players who believe they are entitled to a perfect lie in the fairway and pretty much roll the ball regardless of the situation.