Great post, North. Couldn't agree more. It's actually all very confusing when one hasn't done enough research. I found that by going heavy (for me at least) for 4-5 reps gave me explosive power in the moderate weighted lifts I used to struggle with. Don't underestimate Heavy Lifting for sports.
I would say that there are better excercises for explosiveness than benching. Like somebody else mentioned, explosive squats and military presses would more than likely be even better.