I'm relatively new to the Macbook Pro, but have had the iphone for many years now.
I love the seamless and smooth integration between both devices, and their excellent retina screens. It's so easy to access photos, text messages and other apps across both devices.
iCloud is also an excellent way to backup my iPhone and hold files in the cloud. I haven't yet tried to backup my Macbook Pro using iCloud, so I don't know if that's possible to do.
I love the experience of using my Macbook more than I do the iPhone. The quality is amazing, and it's great to be able to use the device and do stuff without worrying about constant updates, laggy performance, and spyware etc. I love the operating system too! Even the font rendering on Apple devices, to me anyway, is miles ahead of Windows! Even with Windows 10, my eyes seem to prefer the font rendering of iOS and macOS.
I don't miss Windows at all, and don't feel the need to use Linux so much now.
I'm enjoying learning XCode too, what a great learning environment! Apple provide great free learning resources too.
So overall, I'm happy!