I'm going to leave a queue at a dining establishment if whoever at the counter doesn't so much as acknowledge that I'm standing there within 90 seconds
Do you really have to leave the queue like this?
Yes, I am inpatient and I deserve to be waited on right away or I get angry.
I get that it's normal to want service as it's supposed to be, but you need to be patient about potential problems like slow service or bad days. It happens to everyone, and you can't throw a tantrum each time you will look immature.
I'm throwing this little tantrum so that they will notice me and realize they need to attend to me.
The service industry can be a chaotic and difficult place to work. It's better to be understanding and patient with them. They'll appreciate you more as a customer and will be more sincere in their efforts to help you.