From the perspective of a recent switcher, I can tell you about "all the little things."
1. Good all around hardware quality. There are a
few (note the few) laptops out there that are thin, light, have good battery life, and a quality chip. In fact, the macbook and macbook pros are the only computers that seem to have it all. A few Thinkpads will be slightly lighter, but have less power. Some Sonys will be thin, but have bad battery life, and so on. Mac hardware really seems to have a good balance between all the important factors for a notebook.
2. OS X is really awesome. Not only is it pretty, but it has a lot of functionality that is missing from Windows. Example: Expose. Alt+Tab is really pathetic when compared to Expose. The Dock is also a much better concept than a "Start" menu. And Dashboard, what can I say except that it's my favorite little toy
3. It's pretty. The hardware that is. Macs are by far the best looking computers in the world. Nothing even comes close. I want to use my computer now, rather than thinking of it as another appliance.
4. Trackpad is so much better. The macbooks/pros have a much larger trackpad than regular PC laptops. It makes using them much, much easier. Also, putting two fingers on the trackpad is much better for right-clicking and scrolling. On my old PC laptop, I would have to keep two fingers on the buttons: one for the left and one for the right. Scrolling was also a pain because it was off to the side, and I would sometimes accidentally swipe it. This doesn't happen on a Mac laptop.
5. Setup is super easy. It took all of five minutes to do everything. My old PC laptop took about 45 minutes to setup. My dad actually looked at me with a confused face when I told him that I was already surfing the web, only a few minutes after I had opened the box.
6. iLife is a great thing to have. Even though I haven't used all of the apps yet, just having them waiting for me is great. That's worth at least a hundred or two.
7. Everything plugs in without trouble. My old laptop (an HP) had problems with our printer (also an HP!!!). My mbp was ready the second I put in the USB cable. I had to do nothing. The same was true for my digital camera.
All of these things have proven to make my Mac experience just awesome. In fact, my dad even wants to use my computer from time to time, even though he fought tooth and nail to convince me not to get it. Even he's considering getting a Mac now! Anyways, just my perspective.