Nigel,
I teaching-pro buddy explained once that the "tougher" courses when set up for tournaments tend to dictate most shots on any given day. Exceptions would be if a player drives it much, much shorter than the rest of the field or much, much longer. Or if there's significant wind it may change the obvious play from day to day. But most elite players are going to figure out the same low-risk line and shot selection for most shots when they are in a stroke-play tournament that will be decided by finishing up a single stroke better than anyone else in the field over 54 or 72 holes.
Most of the "strategy" or "tactics" or mental-game stuff a tournament player focuses on has to do with judging what his shots are going to do under a given set of condtions (lie, wind, pin position, how his swing is working at the moment) while treating the line and shot selection as pretty much a given. There are just not enough meaningful options in play once you lengthen, toughen, narrow, speed up and polish a course into "tournament" condition. It doesn't make sense to be inventing alternate ways of targeting your shots on the fly when the purpose of the exercise is the execute, execute, execute with as close to perfection as possible. One extra seriously bad shots can undo a lot of fractional shot gains from trying to find a better way to negociate the course than your competition.