Ok, it's a slightly jocular title, but it expresses a feeling I've had for a while. There seems to be a general consensus that downloading images through your camera's USB connection is evil (I remember chuckling at the way Michael and Jeff munched garlic and made cross signs concerning this on the LL LR tutorial).
I can appreciate that if you come back from a shoot with a brace of cards to download then your best option is a dedicated reader (ideally a FW800 one such as the Sandisk, Rob Galbraith's site shows very little difference in general between ExpressCard solutions and USB2 [edit: Jeff: ExpressCard is definitely *not* faster than FW, and *definitely* not 'bus speed', sorry, but I had to say that]). But if I've only taken 200 pics or so I don't see that I'm losing anything by simply fishing the USB cord out of my camera bag (where it lives in case I ever want to tether on location) and dling through the camera's interface.
It runs the battery down? Big deal, my Canon has gone 1500+ on a single battery and I always rotate batteries and recharge the used one(s) after a shoot anyway, LiIon bats like to be full. I can't think of any other coherent reason not to use the camera as a dl interface (apart from accessory manufacturers wanting to sell you more gear).
If I've missed anything important, please instruct, but this looks to me like a balloon that needs to be punctured.