Compared to the rest of the US, theatres in NYC are smaller. Most road musical houses start at 2000 seats and no Broadway house seats that many. There is something psychological about being toward the back of any theatre, but Bway houses are not huge, huge barns.
As for Radio City (5800 seats), this is not an intimate little show in an intimate theatre. Its a great big show, and even they call it 'a spectacular'. You might appreciate the distance away from the stage that the first mezz gives you.
"If my life weren't funny, it would just be true. And that would be unacceptable."
--Carrie Fisher