Snakes do not "like" things the same way people do. You are anthropromorphizing. The snakes are operating off of instinct.
As for those who say feeding live is safe. Obviously not as safe as frozen/thawed feedings. If anyone has ever been bitten by an adult rat (my my had 10+ stictches in her hand from a large male once that she had as a pet) then you know the damage they can do. Regardless of how proficient your snake is with hunting, it only takes one missed strike or misplaced hit for the rat (or mouse) to severely injure your animal and cause damage. Know the risks if feeding live.
Having said that, if the animal will eat nothing but live you have no choice. All of my ball pythons eat f/t and I am thankful for this as for me it is both cheaper and more convenient. My emerald tree boa eats nothing but live and I have to go out of my way every feeding to get a live hopper mouse for her. Being allergic to rodents keeping them on hand is not an option for me and I have no desire to tend to or take care of my snake's food. That is an even larger inconvenience than getting the one hopper every couple of weeks. (Lucky for me etb metabolisms are much slower and they require far fewer feedings.)
I'm not advocating one way or the other and I think whatever works best in getting meals into the snakes is probably the best course. I just think that sometimes the risks when feeding live are severely downplayed and we shouldn't lose sight of the damage that can be inflicted when feeding live. Personally, I prefer my collection without scars and with all their eyes in tact. But again, like I said, lucky for me, every one here eats f/t except one snake.