I have. It's not easy. It requires zooming in reeeeaaaaaalllly close to get the cursor where you want it. Then the browser tends to very easily zip back out so you're left squinting at your own wisdom in Flyspeck Legal Condensed 1.2 pt...

Besides, when any given web page is fully zoomed out the links tend to be very close together. For a person with ordinary-sized fingers, like me, it's easy to select the wrong link or button by accident.

Also, it sometimes takes several tries to activate a textarea, I don't know why; is it because the touch must be long enough, short enough, just the right length, just the right area (pressure), or do I move my finger too much?