Is an IFR flight more or less work?

I think someone here said that you really need a copilot when you fly
IFR. If so, what duties does the copilot have? I'd think that IFR
would be no more work than VFR, especially since ATC is helping with
directions and there is often some degree of automation (autopilot or
something). So, what's the story in real life? Is it really more
work to fly IFR, or more work to fly VFR? I'm thinking that VFR you
must spend a lot of time reading charts and looking for landmarks.

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