Many thanks for all the opinions, guys. This is very interesting. Looking in from the outside, I figured Mac users were always delusionally happy, but apparently not. Kinda healthy, I think.
A couple of clarifications:
I'm not an engineer. I have a degree in electrical engineering and computer science from Berkeley, but it's almost 40 years old. I couldn't solve a differential equation today to save my life. I spent a few months managing volts and amps after college before I went on to what I really wanted to do. I still think like an engineer, however, which is a very good thing, in my opinion. All those engineering and physics classes paid off that way.
Why leave Windows now? Good question, and one I think about a lot. I'm tempted just to build another screamin' Windows machine with twice the performance at half the price. The thing is, I spend a lot of time making Windows work, which is fun, but I'm getting tired of it. I've purchased Macs for everyone else in my family simply so I don't have to work on them. (I've spent a lot more money on Apple products than I ever have on PCs.) I have an iPad and an iPhone and I think it would be nice to see how the integration works. Besides, I'm under pressure from the family to switch to Mac. Join the cult, as it were.
Anyway, thanks again for all the opinions. I'm still not certain which machine to buy, but I thoroughly enjoying thinking about it. That engineer again....
Cheers.