That. And they're typically more concerned with getting sticks/skates/bodies in passing lanes. At least, they should be.
There are always exceptions, but I coach most teams to give the strong side point the boards as far down as the hash-marks and concentrate on taking away his passing lanes. If you're defending the passing lanes correctly, you can almost always get to the shooting lane as well; AND unless said defenseman is an exceptionally skilled shooter, he's not going to do any damage from out there, anyway. Presuming the angle is played correctly, they're almost always forced to dump the puck in the corner and get back to their positions. Gotta be careful not to let them get too low, though, because a savvy winger/center can trigger a low-to-high cycle which can be tricky to defend.
Ahhhhh...the classic "Here, let me tell you how to do your job, while I neglect mine." It never gets old...