While this doesn't necessarily negate the "we can't remember syntax" argument...I remember back before mobile phones were rampant, I was really great at remembering phone numbers. People besides by parents were regularly surprised at how I'd remember numbers I'd seen or read just once. Then I got a mobile phone.

I think I probably have less than 5 numbers memorized (those of my immediate family). In essence, using an IDE encourages us not to memorize syntax.