I too transitioned from the PC world to a mixed PC/Mac environment, and it took me a while to get the hang of a Mac. It's really a different paradigm altogether. And it does take a while. And while nothing is perfect, the Mac has a lot going for it. It isn't really ease of use, just a different way to look at things and I believe that you just can't do it in a few weeks. It's a little like trying real hard to learn the piano in 2 weeks, after having played the guitar for 20 years. It's just different. Can't be done in 2 weeks.
Don't give up on it, just yet. Get your iMac back and just play with it from time to time. Things may look different a year from now...