This topic has been aired in many threads under various guises before, but it's always interesting to hear some new views, and hopefully some experienced and honest ones from our womenfolk.
My experience, speaking as a middle-range 7"x5", has been interesting, in that both my ex-wife and my present g/f both had previous partners with really huge dicks, but neither had had happy sex-lives, and my present g/f had never had a vaginal orgasm until we met. And then it was initially with my finger! Doing the "come-hither" stroke on the upper wall of her vagina. She came like a rocket, and proved to be a really wet cummer, which sent me wild. Turns out her G-spot is hyper sensitive, but very near the front, so hugely hung hubby, whose attitude was "Ram it in hard, bang like hell, and get the fuck outa there," just missed the whole point, hah hah (though successfully fathering children).
Maybe our chemistry was just better. Or the fact that I fell totally in love with her and felt 100% angst free. Whatever, she turns out to be the most orgasmic woman I've ever met. She says that the size and width of my cock head is very stimulating.
Although I'm not huge, my ex-wife would never go on top, because even 7" just went too deep and hurt. Even after we'd had kids.
So, thedigital and undercoverblk, there's my two cents worth. I've never ever thought of myself as having more than an average dick, but if the stats are to be believed, even a modest 7" is 1 in 8. This site helps.