There's an interesting article in the BBC online Magazine about Graveyard Etiquette.
There are no rules for visiting burial sites and a number of different groups have fallen foul. Birders for instance can get in trouble when a rare bird arrives at a churchyard, there have been reports of birders trampling on graves to get a good view.
The public probably are unaware that the 1977 Local Authority Cemeteries' Order sets down some basic laws of conduct. Creating a disturbance in a churchyard, committing a nuisance, wilfully interfering with burials or graves, or playing games or sports, are all finable offences.
Personally I'd find it hard to argue with that but i've seen kids use graves as climbing frames as there parents looked on. They got told to show some respect by me though.
There was anger in Scotland recently when a family picnicked on top of one of the grave mounds at Culloden. As someone said such behaviour would not be accepted at World War I battlefields such as Flanders or Ypres.
The National Trust for Scotland and are currently having signs made up to explain that the battlefield is a war grave and asking visitors to behave accordingly
Of course even those who should no better get it wrong.
St Mary's church in Wimbledon Village charged tennis fans £20 a day to park in its burial ground, it justified the decision by saying the graves were 200 years old or more. No living relatives would be offended, it said. It also gave the money to charities.
Are we less respectful? I think we are. Part of that is that previously families stayed in the same area and therefore were able to pay respects and keep graves in good order. Now we all live miles apart and graves are left unattended, of course that is no reason to show disrespect.