There would still be huge tidal stresses, massive earthquakes, and anything not nailed down (like oceans, atmosphere, people, soil...) would shift in a big way.
It reminds me of science-fiction stories (Rocheworld, heh) by Dr. Robert L. Forward of two planets which were so close that ocean...
In light of the recent CERN CLOUD results, and the probable importance of gamma rays on cloud formation, has anyone thought about the possible climatic effects of gamma ray bursts from a nearby super nova? (I was thinking mainly of Betelgeuse at 640 ly, which could go off any moment in the next...