Telerik has conversion tool. It works quite well on simple cases, just does not help with converting master pages to layouts. I've used it to convert my project (several hundred views, up to ten master pages) - it took some time to figure out how to map master pages to layouts, but overall went quite well.
Is it worth it?
Well, it depends, mostly on how much is your project covered with tests. Razor syntax is much cleaner, I like layouts better than master pages. I always think, that migrating to new version has one serious advantage - it is a reason to review all your code, refactor things and so on, another serious advantage is to work with current technologies.