That 120 minutes can turn out to be better than half of your day! They will offer you breakfast when you arrive (which is not part of the 120 minutes) and then they'll want to place the kids in a playroom setting so that you're not distracted.
Then they'll take you in a golf cart to the far side of the resort, making it darn near impossible for you to walk back to point A. They'll bring one supervisor in after another pressuring you to take advantage of that one last not-to-be-passed-up deal that they have to offer you. The more that you say "no", the harder they will pressure. And all the while, a mighty distance separates you from your kids and your car.
In some cases the salepeople will get downright beligerent and rude when you refuse their offers. When they finally give up, it will take them forever to take you back to point A, where it will take another lifetime for them to issue the tickets that they promised.
If there's no other way for you to afford the tickets, and you have the time to waste, then watching the whole scene unfold could be kind of entertaining. If you have places to go and things to do, it can be extremely frustrating. It's not something that I would do while on a Disney vacation.