Doctor's Office

Why is it that when you go to the doctor's office... unless you are the first three people there... you won't see the doctor for 2 or more hours... this truely is a waste of time... they should have those buzzers you pull--like at restaurants... when it gets close to time... say like 15 minutes OPE there you go... buzzer went off... NOW go to the doctor's office... that would be super :)