No. The workstation market has been hovering around +/- 1% growth for more than several years now. It isn't imploding but it is not a growth market either.
"...
Q2’16 a good quarter for workstations, no excuses or disclaimers necessary
Lately, we've been having to put a lot of words around any positive commentary we make on the workstation market. Flat to modestly down numbers have been all-too common, and even up quarters had to be tempered, as more often than not a positive performance was just making up for previous lost ground. ..."
http://jonpeddie.com/publications/workstation_report
Q2 '16 was out of the norm, but bubbles pop up from time to time.
Not toward the end of "Steve's era" which is why
Steve slow rolled Mac Pro development. The "nothing" in the 2012 time frame is because Steve did nothing in the 2009-2010 timeframe.