I have not really had to wait too long to see a doctor here, though if you have not been ill over a week, they will sometimes try to discourage you from making an appointment - they will also be hesitant to prescribe any medication to help you and tell you to go home and let the body heal itself or "wait and see". Though it sounds like a good idea, many GPs here are not qualified enough to make these calls, and there are endless stories of catastrophic results (some in my own family, I'm sad to say).
There is a daily "spreekuur", where you can go in without an appointment to see the doc, and you can wait anywhere from 5 minutes to an hour and a half, depending on how busy they are. There are waiting times for some thing -for example, my wife just waited A YEAR to get surgery - it was non-life threatening, but still, that's quite a wait! (she needed that surgery as a result of the GPs telling her to "wait and see" about a previous condition, resulting in a lifelong problem which probably could have been avoided with a simple medicine which is standardly prescribed in most western countries within 48 hours of outbreak - but not here according to several Dutch GPs - the specialists would have prescribed it, but it took a month to see them and by then it was too late for the medicine to be effective) - She also needed a small surgery for an ingrown toenail, and they made an appointment for 2 weeks - after a few days, she couldn't take the pain anymore and went to the emergency room, where they performed the surgery within an hour.
I had a friend with cancer and another with Sudden Arrhythmia Death Syndrome, both young - they received the proper treatment and are doing well - on the other hand, my colleagues mother, who had a lump on her body, was told by her GP that it was "nothing" and there was no reason to do any tests at all - she died 6 months later of a very treatable form of cancer....
The problem with healthcare in NL, in my opinion, is more to do with the dismissive attitude of the GPs - I can't tell if this is more to do with Calvinism or whether it is an attempt to keep as many people away from specialists as possible, so the system isn't as overloaded - the GPs, however, who are the "gatekeepers", can be very difficult - they seem more interested in keeping you away from specialists than in truly helping you - for example, I once had a very irritated throat and wanted to see the throat specialist - I had to go back to the GP 3 times over a month before I was finally given a referral - when I finally saw the specialist, he gave me some tests and said "Oh, I see this all the time" - and he gave me a prescription which cured me within an hour! They also do no real preventative care here - they don't even take your blood pressure unless you request it.
The system on paper seems OK, especially when compared to the US - and apart from the monthly payments to the insurance company, there are no co-pays and I never have to have cash when going to the doctor, the hospital or the pharmacy. My two friends with the cancer and death syndrome would probably not have had insurance in the US - and the one who needed a pacemaker corresponded with Americans who had the disease and was shocked to learn that many had to sell their businesses or homes to get what he was given for "free" here.
However, there is a slowness to react here which can be deadly - I do not feel safe or confident with the GPs here - they're fine for small things, but I feel in much safer hands with doctors in the US....the irony there, of course, is that US doctors are more thorough in part to avoid lawsuits, which of course means lots of unnnecessary testing, driving prices up...