I didn't think the A3 was quite that bad really. I lane split up Tibbets Ride and managed to get round the outside of a couple of bikes on the roundabout. Had a minor slide on some compacted snow in the gutter, sorted that out with a bit of countersteer, shot down the inside of the cars waiting to join the A3 and made steady progress between lanes 1 and 2 until I got out on to the A3 proper. I kept the bike in as high a gear as the engine would stand and stayed off the brakes wherever possible. Once on the A3 I kept my speed down to 50 and left a large braking distance.
The only difficult bit was coming into Esher where the snow had settled and I was having to filter on frozen snow in solid traffic. Still, I outdragged the cars away from the lights on Esher High Street and was first into the bend leading to Hersham By-pass, where all the cars were cowering in lane 1 while I came past them in lane 2.
Got home, got off the bike, found a good snowball-fight's worth of snow trapped between my chest and my tankbag, had a fag and wondered what all the fuss was about.
If you panic or tense up and stab at the controls, you will end up on the deck. If you take it steady, you'll generally be OK.

Besides, you can only die once so what's the point in worrying about it?