The main reason I would want to get a Windows Phone is for the camera. Nokia still seems to be the closest one gets to getting a reasonable point and shoot camera in a smartphone.
I started with a blackberry, then moved to iPhone 4S. Bought a MacBook Air, Mac Mini, iPad and now I am using a Nexus 4 for my main phone. My main workstation is Windows 8.1. Note that I rooted both the iPhone 4S and Nexus.
At this point, the camera is not enough of a reason to switch over. I'm over the app love I used to have with the iPhone ("wow, all the cool apps!!") so the lack of apps doesn't mean much. I'm just platformed out. The thought of switching to yet another platform and going through all the hassle isn't worth it anymore.