Was talking to a friend who mention something about not needed a google sitemap anymore.
Keep in mind the conversation was about getting websites indexed and ranking for keywords ect
Is it still a good idea to use a Google Sitemap?
Actually, it has never been needed really. But is it still a good idea? I would say yes unless you don't plan on adding content regularly to your website.
Say if you didn't have one, you would have to rely on Google to search through links on your site to find it, and depending on the structure of your website, and how often they check your website, as well as how hidden(deep in) you have it, they might not find your new content. Plus.. say if you had a Wordpress site for example, you might have categories or archived pages nofollow/noindex so they wouldn't be able to go far to look for the content.
So with your sitemap, they will know where everything is, and you can even resubmit your sitemap through the google webmaster tools to give them a heads up that there is new content. Then they'll just have to check your sitemap.
If you didn't use sitemaps, you would have to rely on submitting each URL separately, which would still work out in the end

But more work and more complicated.
Edit: Also, if you're using Wordpress, there are plenty of plugins out there that will automatically do this for you. It creates your sitemap based on your posts, and when you add a new post, it will update your sitemap automatically.