Do you bother rolling for an enemy's attack roll, when your Strength/Craft is so much higher, that you know it will be a win?

It depends.

There are some Enemies that can kill you depending on their attack roll like the Basilisk, so it's not just a matter of defeating them.

Yes, because I roll both dice at the same time anyway.

No

Yeah some players roll 2 different die one for the player one for the enemy-creature. Some players don't but you do if there is some other effect linked to the die roll number or numbers.