I went through a similar transformation a few years ago, and I found it profoundly unsettling. I think it is largely (for me at least) a result of the internet multitasking that has become so important, but it has made grading essays very difficult for me. I find that I now have to physically isolate myself to be productive. I seem to have fewer problems with one-on-one contact, but large groups? Oy. Takes a real effort.