Confluence needs to support opening a link in a new window.
Although I admit that it probably shouldn't use target as that's deprecated, it should still do it (article on standards compliant way: http://www.sitepoint.com/article/standards-compliant-world).
Wordpress does it and I use it all the time. Within a week of us rolling out Confluence at my company, people have started asking for it.
I am aware of the
CONF-1210, CONF-7045, and CONF-6947 marked "Will not fix," but this is a simple feature found in competing products which users find useful and I wanted to open it again and get votes behind it.
macro doesn't do this for external links so it doesn't satisfy this requirement.