I have a 2 year old son and a 12 year old brother. I almost exclusively only get to scrap boy layouts. When I DO have the opportunity to scrap a girly page, I absolutely do.
I'm also not opposed to occasionally scrapping my son with flowers and such... I don't see that a well-placed flower in the midst of a cluster is really all that girly.
I also will say that I used to do a lot more clustering when I was scrapping more friends' girls, or me-centered layouts, or things like that, but now that I do more boy layouts, I do less clustering, more paper-filled, graphic, clean line layouts. I'm not sure if it's because my scrapping style changed (and I do love me some papers!) or if it's because I feel less inspired, overall, by boy-ish elements. Maybe it's both.