I started with Drupal for a CMS, and didn’t pick up WordPress until just a few days ago, though I have seen mentions of it everywhere.
Initially I used Drupal for a blog, then expanded it to forums. For the blog portion, Drupal was good, but WordPress is so much better. WordPress is easier to use and upgrades and plugins can be done from the web interface (rather than needing SSH access). Much smoother.
I’m a happy wordpress user now :)
I am still keeping my Drupal site for forums. It serves its purpose.