I try to play the wind when I can, but if I'm stand hunting, it's a lot more difficult to not possibly cross trails that deer may travel prior to my stand. That's where I believe that scent control plays a very big role. I hunt very thick cover and sometimes I almost have to walk across a possible trail. Rubber boots certainly help!
I'm with others that believe that less scent can lower their alert level. I pay close attention to scrubbing as well in the shower to help remove the shedding dead skin cells, which seems to be a primary scent that puts deer on alert. Foreign smells vs. human scent seem to spark different reactions. In addition to cover sprays, I also rinse out the detergent holder on my washer (front loader) then run a spin cycle of just water to help flush it and then wash with baking soda. Outerwear gets washed once in a blue moon, but wash inners often. Just my 2 scents.
Mike