The MediaCore folder is pretty handy to keep plugins between versions when upgrading versions. But scripts & presets still need to be copied manually (which is quite annoying).
If there's a location like MediaCore where all AE versions can pull plugins from, why shouldn't there be such a location for scripts & presets? My biggest pain point in upgrading is "all" the manual work involved, which feels strange since updating itself is real easy with the CC app.