Once you go Mac, you don't go back. 
I switched when going to college in 2007 after working with Macs in my high school journalism classes. However, I never had a long term hate for Macs since I could remember using them in elementary school and even helping install the first iMacs. 
Like Lokiju, I was still nervous and got a bootcamp partition for Windows since I was planning to use AutoCAD. Now, I now rarely need the partition since the only paid program I used (MS Office) has been sufficiently updated in 2011. Even for games that I really want (like Empire Total War back in 2009), I just can't bring myself to paying for something that would force me to keep Windows. The fact that AutoCAD has finally returned to the Mac and Empire Total War will arrive soon are two examples that software companies are recognizing Macs as a newly viable market. 
As others mentioned, the hardware is very nice and works well together, especially the unibody MBPs. Why else would other makers gravitate towards the chiclet keyboard or large trackpad? Many people have mentioned the trackpad because it's one of the highlights of any Mac laptop. That's how it is with many things: you forget about the UI precisely because someone at Apple spent time to make things as unobtrusive as possible. 
If you want to increase your productivity, I suggest getting the app Quicksilver or using Apple's own spotlight feature to easily navigate between programs/files.
Good luck with your decision.
I would just like to add that I'm watching the landing of NASA Curiosity rover on Mars, and it's interesting to see almost all the engineers working on Mac laptops.