Hm. I'm interested to know the metrics behind "was pretty painless".
I've heard some fairly bad horror stores from folks that run > 3,000 windows desktops. I'm not a windows guy so I don't know if the horror was self inflicted, caused by their admins not doing something right, or if the blame can be laid at Microsoft.
I will say that a OS that takes specific, non-trivial processes to not automatically and preemptively molest the install base is likely something I wound not give approval to.
I said in another thread about firefox and Java that we've come to the point where we have to take defensive measures against the very people we trust to make software tools. I feel that's asinine to be forced to come to that pass.