It's not that bad! The officiousness at Sheffield seems to be limited to announcements. Incidentally, Derby was similar for a while (don't know whether it still is - not been there for ages).
Owing to the volume of services the announcements are still controlled locally at Sheffield. All other EMR stations are managed from the East Midlands Rail Operations Centre at Derby.
I wouldn't call them officious but they're definitely Yorkshire - watching the platform staff deal with any misbehaving members of the Saturday Night Crowd in normal circumstances can be entertaining!