For what it's worth I have had a strip in North Dorset for 10 years. The only unannounced arrival I have ever had was a poor chap who's engine shed some essential components within gliding range.
As to the watering grass incident I have some sympathy with the pilot, this sort of thing can be a safety issue! Though maybe he should have tried to find someone, on the other hand if no one very obvious about why waste their time.