I'm with Indypower and JDgreen. I plow snow on an "as needed" basis.
If there is a lot of snow, I'll clear it when it gets to over about 5-6 inches, even if it's still snowing. Then I'll plow again either when it quits or starts getting deep again. If it's only a few inches, I wait until it stops snowing.
I use a snow blade on my Craftsman lawn tractor and it works OK on the dry powder. The problem with the snow blade is that when the snow starts getting deep, there is no pace to push it. We have had a lot more snow than normal this year and a lot more heavy wet snow than usual. I have a snowblower attachment on order that should be here in about a week.
I normally plow the sidewalks on my entire city block and most of the block across the street for a total of about 12 sidewalks. I also do most of the driveway approaches since my street is designated a state highway, the road is plowed by the State plows, and those guys have a real knack for plugging a driveway, usually about 10 minutes after I finish plowing.