I've been playing healing NB exclusively, it works out very well. But, at VR1 I still haven't figured out which 2nd weapon I want to use.
I don't think healing really changes much, it may even get a little easier as tanks get tougher. It's the killing things while questing that makes a big difference, I went back to Cyrodiil and killed a few mobs and wow, pre-VR was way easier. On the bright side it really makes the questing fun enough to do.
I'm sure upper level content fill face further challenges but I'm sure I'll be up to it.