In a previous thread about VR, someone was quite negative about the utility of VR, but ended with “talk to me once there’s an Excel of VR.”
There are billion-dollar opportunities here, but only if VR is accessible as a platform in the same way a PC is.
To your point about backpack VR, however, the Quest will undoubtably accelerate these kind of use cases!
But then you'd run into the big (and hard-to-fix) limitation of first-gen VR, the very low pixel density compared to conventional displays, which is a particular problem when you're working with text. It's a problem with is partly compensated for by the unlimited virtual screen size that VR gives you, especially in comparison to the small and awkwardly-placed screens you're often stuck with in a mobile context. So you could certainly give it a go, especially if you get one of the highest-res WinMR headsets, but on balance the laptop screen would probably still be more practical for coding today.