So if I leverage my time at work by 50% because I know how to use AI tools (and technology in general) to do things more efficiently, does that mean that I get to work half days for the same salary?

Another reason to be your own business.

Employees will never be the benefactors of technology, even if it’s the employees that have the knowledge and wake their employers up to the possibilities. It’s only going to ensure that the number of tasks the employee is expected to cram into a ten hour shift will increase at the same rate.