When someone is hit by a drunk driver it absolutely can make a difference in the settlement. Every case is different, the circumstances are different, and the insurance coverage is different. So, there is no hard and fast rule about how it may or may not help.
In Florida, remember that a drunk driver has committed an intentional act by driving drunk. This means that they can be held responsible personally for punitive damages. These are above and beyond what they have to pay because of the injuries they’ve caused to the victim. Punitive damages are to punish them and it's the personal responsibility of the driver.
Most insurance policies won’t pay for punitive damages but the insurance company in some cases will pay more to get a case settled in order to protect the drunk driver from being sued personally, and that can affect and increase the value of the settlement of someone’s claim. So, there is a way that your lawyer, and they certainly need to understand how this works, can use these circumstances to make the claim more valuable.