I prefer bliss as a more accurate descriptor of my reaction to incredible food

Except that bliss all by its lonesome doesn't say that there is food involved. If you're sitting at table and have just bitten down on a slice of excellent haggis and say, "This is pure bliss," then it's pretty obvious what you mean, but if you're describing it the next day to a companion then foodgasm has it all wrapped up in one word.