It's the interpersonal relationships that help us remember that in some way, shape or form that these characters are real people who have real lives outside the BAU. I for one don't expect any of them to be chained to their desks and never doing anything but catching pyscho serial killers/stalkers ect. I liked knowing that Garcia voluenteers at a grief group. It helps give these seemingly untouchable characters depth and personality.
I know a lot of people would rather they not write in AJ's pregnancy. In some cases it's so much easier to write it in than try to hide it. How strange is it for someone to disappear to Italy for a cooking school for six weeks? Or whatever other excuse they give to a cast memeber how has taken time for personal reasons. It will be nice to give the team a bit of family sense again since we lost that after Haley and Hotch divorced.