Yes and more to that point, it is trivially easy. A Stanford class had you case out for the [at] in an early assignment of writing a spam bot a few years ago. http://www.google.com/recaptcha/mailhide/apikey might be more effective, but the best thing is just to have a great spam filter and accept that someone will guess or find your email rather than trying to hide it.

Remember that an email address can be spread around more than by crawlers too. Sign up to a grocery store discount card with it? It is in some for-sale database somewhere.