There are bots that scrap for emails on the monthly who's hiring etc posts. Made the mistake once of posting my email in the original formatting, got some funny scam emails. So they are still around
name at example dot com
I have seen some people doing things like //\\//name\///at\\\///domain///\\com which might be more unexpected, and therefore might help. But any practice if it becomes common will be seen through.
If you posted your (let's say) Gmail address on HN, the spam level of your inbox wouldn't change. Gmail might work a bit harder filtering out some spam, but it would be lowest-common-denominator stuff that they easily recognize.