I (like many others) use symlinks as an effective way of sharing code+assets between multiple projects. Unity had already intentionally disabled them on OSX, and now they did it on Windows too. They still haven't said why they are disabled, other than that they "cause problems".
If you're going to take out symlinks, then please replace them with ANY way of actually sharing code between multiple projects.
I've created a Unity Feedback request here, please vote if this is important to you: http://feedback.unity3d.com/unity/al...windows-and-os