I'd argue the point that people know who the members of Pink Floyd are though.. I think it's the opposite. They can walk around generally without being recognised and considering the success and album sales they are reasonably unknown as individuals, maybe with the exception of Gilmour.
Lindsey is a bit unknown to the general public outside of Mac and as I've mentioned on countless occasions its one of the causes of his neuroses IMO. I don't think it helps when people think hes the female singer of the band too "Oh Lindsey, yeah the chick"