From my experience, Trek and Cannondale "shrink it and pink it". They put shorter reach shifters, narrower bars, usually shorter cranks and a women's saddle then say it is WSD. Specialized uses a different geometry. I cannot ride Specialized women's mountain bikes even though I am the "typical" WSD build. I like a longer top tube on my mountain bike and yes the WSD is also much more upright which I didn't like. My Specialized mountain bike is my first unisex bike.

So yes, some people it is marketing BS. Some companies actually put thought, resources and engineering into a different geometry but some men should ride the WSD geometry.

I got totally duped when I bought my Cannondale thinking it was a different geometry, then when I found all the aches and pains I was having I looked at a geometry chart and realized I hadn't done my homework and was paying the price with an ill fitting bike. On a road bike I like a shorter top tube for comfort I don't like aggressive geometry road bikes, my plan is to sell my Cannondale at some point (when I can afford a replacement) and will likely go Specialized WSD.

If you like a Trek and hate the women's scheme get the "unisex" and you can swap the bars, shifters and saddle then you're pretty much at WSD.