Drupal 8 has lots of things that Drupal 7 doesn't have - a modern object-oriented foundation, the Twig templating system, and WYSIWYG out-of-the-box - just to name a few.
Twig syntax is new for most Drupalists, and learning how to check for the existence of a field value is a valuble skill for anyone building a Drupal 8 theme.
A few weeks ago, the Florida Drupal community (and more than a few honored out-of-town guests) gathered together for our annual event. This was the 8th Florida DrupalCamp, so the camp definitely had a familiar feel.