Usually the pain comes when you find you need to use a feature in some software and the feature wasn't introduced until after the version that Centos ships. This happens more often than you might expect. Even fairly "modern" versions of Centos come with some really old and crusty packages.
Yeah, that's fair. I guess I was reading it as a complaint that the existing system had issues, but EL certainly has a painful tendency to not keep up with new stuff (which is rather the point, but that doesn't make it not painful:])