Hi Felip,
Posting on ezine and other article directories are tactics from few years ago and shouldn't be using because Search Engines see that as duplicate content on the web and if the those directories have higher authority than your site, it doesn't benefit you at all in SEO stands. I'm pretty sure most people recommend not to use it anymore.
However, talking about any good for these sort of directories. Yes, i believe they are still a bit useful. For example, if your website is not getting any traffic and you have no luck in building up the traffic via Social or Search, posting on article directories with thousands of visits, it helps your article get more impression. That is the only good I can think of for using article directories now a days.