I went from being a total Windows junkie to loving OSX since I switched over in May. No regrets. My windows desktop is left sitting, while I use my MacBook Pro all the time. I don't know exactly what you consider dumbed down, while some parts are now hidden, they can easily be found with minimum effort.
It's certainly not dumbed down compared to Windows. Shoot, you've got a full bash shell included out of the box! It only felt dumbed down (or maybe I should say "locked down, and candy coated") when compared to my Linux desktop, which gives me a huge amount of customization freedom and built in power tools. I went from Windows to Linux, then to OSX, and I missed a lot of things about Linux while not feeling like I gained anything extra. I'd take OSX over Windows any day, but at the end of the day I want to be working in Linux.
