I noticed a significant increase of shot attempts by my Power Forward from when I started training driving. Shotefficiency dropped a bit according to his boxscores. However I'm positive this is because his opponents got better in inside defence. The manual states that shotefficiency is improved by handling. and since training driving also improves handling it's quite useful for players who have a good shot.
By that I mean that shotattempts will only be made if the chance to score is good enough. If you got a bad shooter, then training driving isn't that useful, what will he do with the ball? However if he is a good shooter, driving will be a very useful skill. I think driving and handling are supporting skills. And they're only useful when there is something to support.