It was one of my favorites growing up. Its the only genre I enjoy. Its sad that there are not many who explore this tag. My bisexual ass is all for girls dressing as dudes.
I like gender bender tag since I started read manga esp girl dressing as boy. I like to see the unintentional harem (esp in boy school) and flustered boys thinking that they are gay when the fall for the cross dressing girl (like Nakatsu from Hana Kimi )
.... I really love gender-bender genre