Is there a cumulative reduction in friction everywhere? I'd say yes. I've used Unix, PC and Mac for years and have always found I get more done and am happier when it's on a Mac.
1. Stuff that I need to get done just works (e.g. sync my Bluetooth phone to address book, hook up to wireless networks, do backups)
2. Aesthetically pleasing. Don't discount this when it comes to hackers... we like elegant code and machines.
3. Unix underneath... no loss of power.