The difference being the 3 point line doesn't move in March and while it is true you'll see better defenses in March, most teams aren't defending the 3 any different. The problem with the home run is that you rely on bad pitching as much as good hitting. When you don't see 5th starters, might see a 4th starter and are facing some of the best staffs, you won't hit many homers. Add on a quick hook and you see better relief pitchers and the home runs disappear.
Teams that can manufacture runs have consistently done better. Teams that can bunt, hit and run, make pitchers work, etc do better. Winning teams don't strike out and put the ball in play. Although bunting is starting to go out of style amongst sabermetrics guys, I think it is only a matter of time until you see a non MLB manager who relies on statistics. But there are certain trends, winning teams do especially when it comes to winning in October and I think you'll start seeing the reliance on the HR go out of style.
http://sportsillustrated.cnn.com/vau...02/1/index.htm