No, it isn't disgusting, it's very unfortunate. Like every other part of the NHS, the ambulance service is under tremendous pressure, and it's a lot harder here in Devon where you've a very large county with a higher than average percentage of elderly residents. The ambulance service has to prioritise calls, it isn't done on a first-call, first-served basis: they have to prioritise, say, a cardiac arrest victim before that of someone who has fallen and broken their hip (and obviously conscious).
On top of that, ambulances are affected by the pressures experienced in A&E units (and we've only got 4 of those for all of Devon): I've lost count of the times I've seen a queue of ambulances at the A&E here at the RDE, because if the A&E is at capacity they may not automatically accept a patient from the ambulance (4 hour clock would start if they did) unless that patient was deemed a priority case.
"Ladies and gentlemen, I've suffered for my music ... now it's your turn" Neil Innes (Bonzo Dog Doo-Dah Band)