I use a few of the Xcode 4 Fixins (https://github.com/davekeck/Xcode-4-Fixins), which despite their name are mostly compatible with Xcode 5. I use DisableAnimations, FindFix, InhibitTabNextPlaceholder, TabAcceptsCompletion, and UserScripts (which I wrote).

A bit of work was required when Xcode 5 came along but from minor version to minor version they haven't needed much in the way of maintenance.