It all depends on your market. You can't ignore IE if your customers are on locked down, corporate workstations with guerrilla IT departments dictating IE only. Know your market, then decide accordingly.
I agree, but the author says they build for 'tech' companies and they want the product out the door fast. In that case, I would care less about IE when the market is around 2%. IMO you can gracefully decrease your support for IE when the traffic is below 10%. The amount of work you do to make your sites work of IE does not justify for the 10%. Just my opinion.