I used to love it when it was still a capable unix with a good UI. At the same time Linux was a horrible mess, none of the desktop environments were passable.
I loved it until Tiger and Snow Leopard. After that it started going downhill. More and more features I really wanted were being deprecated (like the ability to have virtual desktops in a multi-dimensional grid). This was the first big thing that really broke my workflow and I have regretted it ever since. More and more UI things were pushed through I didn't like. The fullscreen mode became (and still is) horribly incompetent. Apps were becoming more iOS-like, dumbed down.
I put up but instead of looking forward to every exciting new OS update, I started worrying about what feature I used would next be removed or mangled beyond recognition. Eventually the negatives added up so much I left the platform entirely. I went to KDE, because that had become a powerful and configurable desktop environment through the years. I finally have my virtual desktop grid back and things are so much better for it. I found that opionated software doesn't work for me (for this reason GNOME won't ever do either). The only reason I thought it worked for me was that OSX's designers had roughly the same opinions as me. But over time this changed.
This was not a coincidence. At the same time Apple changed from a computer company to a lifestyle brand. It started appealing to the masses which started with the iPod but really kicked off in full gear with the iPhone. The Mac is really just an iPhone accessory now. Microsoft has been making attempts at becoming a lifestyle brand too, with hilarious incompetence :') Only their xbox division gets a tiny bit of the way but their main marketeers are such business suits that will never understand 'cool' even if it bites them in the ass.
Oh well.. I still use it for work because it's slightly better than Windows. And our company's Windows desktops are locked down too much.