I thoroughly enjoy well-implemented touchscreen interfaces, which would be things like Windows 8/RT and Windows Phone. One of the most important thing about touchscreen interfaces is that they have to react promptly to user input, and getting no visual feedback is a very bad thing and is very jarring. I actually like how every single object in Windows 8 and Windows Phone is actually on a 3D space, and when you press anything, the object immediately pushes inwards. When you release, it also bounces back, and the action takes place - with a lot of visual feedback.
Some people don't like these kinds of visual feedback, claiming that they waste time, but it's actually an integral part of the user experience. If there's no such feedback, you'll feel a disconnect between input and action. If you have good visual feedback, even if you take a long time to actually process something due to your slower processor, nobody will notice.
I really like using my finger for anything with capacitive touchscreens. However, I do still believe in the precision of the stylus...
Speaking of touchscreens, I can't help but mention multi-touch-capable trackpads and clickpads. The latter does an especially good job in simulating a touch screen, especially with spacious Synaptics hardware with no interference, and slightly frictional surface. Swipe, swipe, swipe, scroll, scroll, scroll... tap, tap, click, click, anywhere, anyplace, any app. It only gets better if your drivers and OS can work together well - think Windows 8 and Synaptics drivers, or OS X and Mac hardware.