I spent years with Linux desktops and laptops. Switched to Mac about 10 years ago. Of all my developer friends I know, not only have I had the least amount of problems with my Mac laptops, but - sorry for the cliche - things just work. The latest and greatest is nice and while I'm not obsessed with having the newest, I like using what's new.
I spent a lot of time fighting the proprietary thing. It's a noble effort, but I realized after years of sub-standard drivers, laptops that don't turn on when you open them, cpu fans buzzing out of control, etc, etc, I'd rather spend my time doing things instead of screwing with things.
Linux is great, I love it on the server and pretty much use it exclusively there. But I haven't seen any laptop manufacturer come close to building any laptop that's close to a Mac laptop. When you start off building based on cost vs. based on function & product, then you're always building something sub-standard. It may seem like indulgence, but no one makes unibody laptops but Apple. No one can.
I spend my days working on a beautiful machine that functions how I expect. I fiddle with very little, don't have to worry about upgrading or tearing anything apart and just focus on getting the things done. You can do this on Linux too for sure, but I feel like for me, the Linux desktop on crappy hardware is not fun or satisfying.
I have a Retina MBPro with 16GB of ram (soldered) and I couldn't be happier. In a few years when I want a laptop with 32gb ram, I'll give this one to a friend or family member and buy another one.