Steam has a VR browser, which I used for my tests. You have to get keystrokes in through a side channel, though, since it steals some vital key bindings including the spacebar, and it has its own screensaver which I didn't find a way to disable (and it can't sense keystrokes through a side-channel). A purpose-built browser wouldn't have that issue. Also, there's no way to control the positions of shells within 3D space or fill the whole 180deg yet.
The main issue right now is resolution. You get a lot more visual area to work with, but at the expense of a much larger minimum font size. I compared the smallest barely tolerable font size on a DK2 to the actual font size I was using on my main monitor, and it was about 3x the angular dimension; that is, the same visual area would either be a 300-column terminal on my monitor, or a 100-column terminal in VR. The DK2 is 1920x1080, so ignoring optics and subpixel issues, a 2560x1440 Gear or CV1 would make that ~2.25x, and a 4k HMD would make that 1.5x.