One of the big reasons to try and make it a standard on your team is about is keeping code clean. Some people don't think they have any use for a tool like ReSharper. They're "proud of manually coding everything without much assistance from intellisense". Well that's just ignorant. And most likely those kind of developers are producing code smells for the rest of the team and they don't even know it or causing themself extra pains that they weren't even aware were walls/pains in the first place on a day-to-day basis!