I get mixed responses from mine.

My CP has heat pits but I don't always dry his food with a hair dryer and he still happily takes his meal. My woma python is the same but womas don't have heat pits. It is still unclear why they lost their heat pits but he eats very well, with or without the hair dryer.

My colubrids (corns and kings) don't care for either way. The response is the same: they perk up when I go up to their cage waiting for food, and they take their food without a 2nd thought. Is it by sight? Smell? I thaw all my prey in warm water. The hair dryer method is the 2nd step if I feed my shy eaters like my boa and ball python, and then I would happen to dry the colubrids food too. Imo, they don't seem to 'see' the food, unless the food is presented in front of them. They most certainly see me as a sign that dinner is coming... Or hoping dinner would come.

However, I think colubrids and some other species do hunt more with sight than smell, ie indigos. But that behavior would be more obvious when observed in the wild. In captivity, I guess working for your food is almost pointless if they are conditioned to see us as their providers.