I think it’s worth it, but it is a legitimate problem for some people.
To fend off uninformed remarks elsewhere in the comments, here’s Wikipedia on the climate of Seattle: http://en.wikipedia.org/wiki/Seattle#Climate
And to fend off uninformed remarks about seasonal affective disorder, which is real but doesn’t account for every instance of feeling bad in winter: http://en.wikipedia.org/wiki/Seasonal_affective_disorder
http://weatherspark.com/averages/29735/Seattle-Washington-Un...