I got my X-Pro when it was first released so I have used it a lot. I use the OFV a bit, especially with some of the primes or the 18-55mm, but I have started using the EVF more. In low light or with the telephoto the EVF is best. For walking around and some scenic stuff I use the OVF, especially if I want to see objects and action that might be outside of the frame to anticipate it. Initially I did not care all that much for the EVF but now I have gotten used to it, nice thing, is it is really easy to switch between it.
The other thing is the X-Pro feels much better in my hands than does the X-e1. I bought I X-E1 for my wife, it is smaller and just not as easy for me to hold as the X-Pro so to that is more important in the long run.