Half the answers seem serious and half seem like a joke.
I'm sure there are scientific studies to explain whether or not slugs have feelings, but...
In my yard, the resident turtles eat the usual assortment of earthworms, grubs, some slugs (but there are not many in that area of the yard), and they seem especially fond of some types of fungi that pop up from time to time. The turtles tend to stay in the more 'wooded' area of the yard where there is lots of oak leaf litter to harbor their main protein sources. Here is a photo of one of the turtles...yes, I know it's mostly of a dog, but it's the only photo I have of the turtle. They tend to be a bit camera shy.
The slugs are mainly in the front yard. Nothing seems to eat them. I learned the hard way
many years ago to not pick them up with bare hands so now I use small twigs in the manner of chopsticks to transfer them into whatever disposable container is at hand and chuck them into the trash.
I only ever see the black slugs as in this photo; they often climb up my front steps hoping I will slip, fall and break a hip.
The slugs in my yard are not as huge as in the northwestern part of the US but they are big enough for me to slip and fall should my Crock shoes encounter on on the damp grass. For me, it's either my life and health or the slugs. They contribute nothing to my garden so I don't mind eliminating them.
In my yard, there are also Rosy Wolfsnails but I cannot count on them to be plentiful enough to control the slug population so I lend a hand...or rather, a twig to eliminate the slugs.
I don't use poison or commercial bait for slugs. One method I would consider would be the half grapefruit up-side-down overnight and dispose of it in the morning. Apparently, if one were to place a grapefruit (after consuming the fruit) upsidedown where slugs are known to congregate, the slugs will hang out in that comfy place and in the early morning, the gardener can just lift the grapefruit, keeping hands clean, and drop it in the trash bag.
There is also the board method. Similar to grapefruit, but place a wide board on the ground and check in the morning. This method requires the gardener to scrape the slugs off the board into...something. Either method is cheap and easy and chemical free.
But wearing wellies and doing the squash/slip and slide works too. I say, "Every gardener for himself! or herself! as the case may be.