From all the fit-related stuff I've read, and going through a pro fitting earlier this summer, the relative height of the saddle to the handlebars has to do with rider preference and flexibility. If your hamstrings (and lower back etc etc) can handle it, sure, g'head and lower the bars (by turning the stem over in most cases). Like anything else, there will be a 'honeymoon' period of 50-100 miles while your body gets used to it. The last thing you'd want is to make a change, ride 5 miles, make another change, ride 5 miles.... Gotta give the body time to acclimate. If you like it, and are comfy, then cool. It's not for everyone though

And yes, you will push less wind, which is a nice bonus.