Like you, I enjoyed OS X and the fact that everything worked so well. But it came to a point where MBP's hardware limitations just got too much (no dock so I had to plug and unplug peripherals 2-3 times a day, battery not swappable so 5-6 hrs was the maximum I could get, no way to have two hard drives (SSD + HDD) without voiding the warranty etc) and I decided to switch.
So far so good, the flexibility and build quality are great. Lets see how long before Windows 7/Debian start to become annoying though ;)