This week I've been getting back into a research groove again - I have to in order for this project to be proposal-ready by the end of the month. I'm missing sharing an office with other PhD students, now. I find it helpful to bounce ideas off of other people in order to think them through. Of course, this is only helpful for me and not dreadful for them if they are doing similar things themselves; my current officemates are terrific, no question, but they don't do research. I miss being able to shout over the wall, "Hey, what do you think about differences-in-differences?" These days I have to walk over to another building to do that. It's likely that in the fall some of these folks won't even be on campus at all, what with not having desks at school.
And I'm not showing up at people's houses to discuss regression.