Yosemite Finder spins endlessly when browsing NFS mounted folders
Oh my... turns out it was one of the .* files in the share.  A simple rm of them all (excluding .git and/or .svn) and I was golden.

What a pain.  Hours gone.  I was unable to narrow down which file it was - a binary search failed so it may have been more than one.

Here's hoping lots of other people can be saved the time wastage.