Canva is a gem!
It saves me a lot of time when I was a marketer for a company that requires daily social media postings etc.
You didn't mention one of the best part about Canva is that it is available and very easy to use on mobile too. That means you can make them off the fly and on-the-go too!
IT IS! Can just create banners out within minutes! Oh ya! Mobile friendly too! Thanks for bringing that up!