It is annoying when they won't believe the parent. The parent obviously knows best because they're with the child 24/7 and they can see the signs nobody else can! It just frustrates me that students going into the medical proffession are actually taught to disbelieve what patients are telling them and always reject self-diagnosis. That's what they're actually taught, so I wouldn't be surprised, but it does make me angry.
And waiting lists are soooooooo long!
I am going to mention what you said about two-language families, because we speak two languages at home, but that doesn't take away from the fact that DS does have speech delay, and it doesn't make his problem any less serious. There is a certain age where speech stops 'developing' in the sense that pronunciation doesn't change, and with age it becomes harder as well, so I wouldn't say their problem should be treated as any less.
But I agree that they whole system itself needs an overhaul, the waiting list is absolutely ridiculous, and then there's the way they treat the patients sometimes!