We are just planning our Exchange Server 21013 migration because there is a opportunity to do it as part of other server upgrades. Nothing i read here fills me with any confidence in the product. The concept and execution of how CU works just sounds brain damaged with so many obvious ways to go horribly wrong i can't imagine how it ever got to see the light of day.
I too have been using exchange since V4.0 and the starting with 2007 version it has just gone down hill in horrible ways since then and continues to loose some of its best features each edition. Management of exchange is certainly a much greater chore to do basic everyday tasks than ever before. Microsoft clearly have very little idea of how their product is used in the real world and I suspect a very healthy contempt for those of us who are not happy with what we've been lumped with.
Exchange used to be such a good product, it is barely a shadow of its former self.