Just because there are empty tables, does not mean you don't have to wait.
I was reading some random restaurant reviews, like I do, and one was 1-star because, "we had to wait even though there were five empty booths."
We have specific sections, and servers have specific tables.
The table you "need" may be in a closed section. We would have to pull someone from their other customers to run over and take care of you. Which we will do, as soon as we can.
If you want the service you *expect* (and I think you're the type of person who needs 100% attention), you might have to wait ten minutes so you can be seated with a server who has the time and resources to give you the standard of service the restaurant, the server, and you, expect.