Advice for learning Drupal from a Wordpress background? Hi all,

I've been using Wordpress for a few years now. I've written a few little custom plugins and have done some theming, so I'd say I have a slightly above-average understanding of WP core and PHP than the average WP tinkerer.

I'm currently working on a new site that I am anticipating will most likely outgrow my comfort zone with Wordpress' abilities to handle enterprise-level traffic. I think it's time to learn a big-boy CMS and dive into Drupal. 

I'm looking for any literature that is written for former Wordpress designers to gear them up for Drupal.. I see plenty of migration tutorials, but I wanted to know if there were good resources to translate my Wordpress workflow into a Drupal state of mind.. 

Sorry if this question is ambiguous at all; I'm just interested in switching to Drupal and I was curious if my WP background would hinder or help this.