Hardcore Ubuntu user here. I come from a Windows background. I mean like for 15 years almost, I was running on Windows. When I first got introduced to Ubuntu (5 years ago), it was a breath of fresh air. I loved the terminal and I loved the freedom of choice and the fact that nothing was thrusted into my throat. It was really nice. Until they introduced Unity. It was one of the poorest User experience designed, ever. Suddenly the OS I was in love with became so alien.

Of course I could switch back to the original normal GUI with a few command line entries and a few option entries. But it was already too late. The flexibility I had in 10.xx was gone in 12.xx. 12.xx become so clunky, heavy and painful to use, that I had to abandon it altogether. I can back up my statements too - Try comparing boot/shut down times of 10.xx and 12.xx, you'll know.

Meanwhile, on Windows, the start button just disappeared. And I DID get used to it, but the fact that Ubuntu's Unity had become synonymous to Microsoft pushing their Metro UI into my throat was a nail in the coffin.

Now I run dual boot - Mac OS X along with Windows 8.1. I'm using the Mac OS for about a year or two now and it's really good at what it does. Almost feels like Ubuntu's 10.xx w.r.t boot times. And I never will be looking back.

Ubuntu is a perfect example of "Don't fix something if it ain't broke."