There are lots of people out there that dislike/hate evolution and I hope the gnome-devs over at Novell give it a face lift. Many people to hate to hear this, but Evolution has a lot going for it, but the interface looks like a dated version of a MS product which doesn't do it any favors. I would like to see it ported to Webkit, include a tabbed interface and generally make the UI more gnome-like.
But the underlying technology, like the data server, are actually really neat systems. Ironically, these are the systems you are trying to turn off. I still think the easiest way to do this is through the Startup Applications dialog in the Settings Menu but I actually use Evolution, so I don't tend to do that.