What I do.... on say a concrete driveway that I edged and now I am blowing off, I start at the road and start blowing towards the house in a zigzag pattern. As I blow along the edges, I am not blowing directly into the grass but instead blowing at a shallow angle so that most of the debris goes into the grass or on the driveway further up from where I am standing. I might blow 3-5 feet worth at a time, then I step backwards a few feet then continue to blow up the driveway as I walk across to the otherside of the driveway. On that side I do the same thing as far as blow a few feet up along the side of the grass/driveway edge, then step backwards a few feet then re cross the drive. I go zigzag all the way up the end of the drive and that is it.
Sidewalks are harder since both edges are so close to each other, I end up blowing one side a few feet, then the other, then stepping back a few steps and blowing straight down the middle. Takes a while, but when I am done the edges are clean and the sidewalk or driveway is clean too, and I don't need to walk back down the same sidewalk or driveway to reblow it on my way back to the truck.
I have found that the more power your blower makes, the faster you will be done. I simply laugh at the guys I read about that prefer to only use a hand held blower, that would cost me major time compaired to my BR600. I also notice that instead of holding the blower tube steady as you blow, that if you move it side to sid somewhat rapidly it seems to do a better job.