I would use it if given the option. I haven't used the Woot deals for a while, but I love the shirts and would definitely be more inclined to purchase if BTC were an accepted payment.
In terms of "not offering any benefits", that's a bunch of hoo-ha. You need things like fraud protection on your CC because whenever you use it, you HAVE to give out all of the information required to charge the card. With BTC, all Woot would need is a shipping address from the customer, and to give the buyers a payment address. Then ~30 minutes later, a quickly redeemable (Bitinstant, Bitpay), 'anonymous', and secure payment has been made.
I would pay with BTC 1000+ times for every one time I have to pay with my CC if I could.