Did I miss this in my training?

I thought Pitot Heat was only needed in icing conditions. Tom Haines column
in this months AOPA mag recommends turning it on in or near moisture at any
temperature. Is this a typical recommendation?

Is there an effect like a carburetor that could cause ice to from in the
pitot at above freezing ambient temperatures?

Since the heat is provided by a hot filament, having it on a lot
unnecessarily would make me worry about finding that it's not there when you
need it.

--
Roger Long