I've tried them, but I have no use for them. In several decades of hunting I've never had occasion to think "I could really use a bigger knob". This has often included getting repeat rounds away, such as when culling. From time to time it has also involved critters running at me.
On the downside, they just protrude more, and are just going to get in the road or snag on stuff. As well, if they add to the length of the handle then then my hand has to move over a larger arc to operate it, so if anything slowing things down rather than speeding up A larger diameter on the other hand, won't fit neatly into the crook of my finger for a ball and socket grip, which is what I use, again slowing things down.
And as for the gloves thing, if your gloves are so thick you can't find the bolt handle, how are you going to find the trigger?
