I'm in a similar situation. My new job is an all-mac shop, which is funny because we are mostly writing software for Linux boxes out in the Internet. I didn't mind though, because they bought me about $5,200 worth of mac equipment to keep. I've been using BSD and then later Linux since 1999, and that was about the last time I used a mac, OS 7. I was expecting to somewhat dislike it, but they do Clojure and I wanted to go that way. I really have enjoyed the change though, and even bought an iPhone.