Training hasn't changed, but as all other rules - people increasingly tend to give a sh*it.
Run up checks at the ramp are real bad, usually for all people around and the neighbors as well. At large airports one often has the run up to be done at the hold, as there is noise from lift off anyways. At smaller airfields I often find rules for run up areas in the AIP or on the plates itself, where the noise abatement treaties between the field and village are documented. Some fields even do designated areas away from parking, taxi or runway.