1 answer
In a perfect world, I would delete anything you don't need. In a realistic world, however, you'll start noticing lots of inter dependencies between everything, and it may be worth less than the effort it takes to delete any unused items.If you decide to go through with it though, I would export all the code and vf to source control first (bitbucket.org has free repositories for up to 5 users until it becomes a paid solution). This way, you have a backup of your code and visualforce at bare minimum.
