Well, online forms for one. Even some of the better responsive websites end up quite annoying to use when the virtual keyboard pops up and can get in the way; with a physical keyboard, this problem is eliminated. Mostly I prefer physical keyboards because there's no lag. This is a more significant issue on Android, but even on iOS there can be a moment or two before the keyboard actually appears, whereas on a BlackBerry you're just ready to go. I also type very quickly and a physical keyboard can keep up, while virtual keyboards sometimes hold me back a bit.