I also clear the street for a ways in both directions so the plow guy has an empty plow when he gets to me. It takes me another 20 minutes, but worth every minute not to have to go dig the drive open in the morning..
+1 - This is key. That bit of extra work will save time later although I don't clear both directions as they always plow from the same way.
We haven't had any significant snow while I've been in this house until this winter. I'm not worried about weight at all but I've got bad ice dams now. I'm not showing any sign of water backing under the shingles yet but it's only a matter of time.