15 years milking strong!
Responsible use is the key. In my experience some people seem to get addicted to it much easier than others and have trouble with control. When I have time off I use heavily and when I have serious work to do I don't even think about it.
I'll admit though, as both an undergraduate and graduate student in Architecture, I found that it helped "inspire" many creative designs. Some of my best grades were "under the influence". Now I have my own practice and tend to use more conservatively.