For many years our species assumed that all other animals acted mechanically and had no feelings. Now popular opinion holds that there are many creatures that feel and form emotional bonds. While I like many will cringe at a lot of the anthropomorphism going on about peoples pets I also think it would be arrogant of us to assume that nothing is going on in a snakes brain. Birds have tiny brains with a structure very different from our own and yet we’ve been astounded at their capability to build a tools and solve problems.
While I think that snakes are simple creatures I postulate that the ability to feel enjoyment in something is a very basic and primitive system, but until we find a way to listen to an other creatures brain we can't say for sure what if anything is going on up there.