I have to out myself as an aircraft-toucher. Started it once, retained the habit. But: I only do it now when I feel the "need". Not so on a 777. Not a rational thing anyway.

When I want to get rational, I only think about how many times the airline, the aircraft or any aircraft does the trip without anything happening, and the likelihood that something will happen exactly when I am there is soooo tiny, so nothing to worry about. Time Magazine recently had a very interesting cover story on risk, which should help you to understand what you really have to worry about. Fat, sugar, smoke, booze, etc...