This happened to me when our company moved at the height of the 1st dot com boom and ended up burdened with space that caused us to close (rumor said about $1mill / 100 people). It certainly was months of disruption. In my neighborhood I can think of Sun, Netscape, Bay Networks and SGI that had this happen. The big move is at least an indicator to look twice.
As one who started at Netscape in 1996 and saw it through to the sale to AOL ($4B Sale, Final Day of Trading $10B) - I'll agree that the constant shuffling, moving, and campus growth was a pretty constant distraction - but what else could they do? Ton of product lines, lots of markets in the land grab, and you needed to put the people _somewhere_
I think Netscape managed their office shifts pretty well from 1996 onwards. I don't think it could have been done much better.
And, one could do worse than selling their five year old company (April 4, 1994 - sometime around April, 1999) for $10 Billion. :-)