Difference between Not even think of something and Not think much of something

not even think of something—(usually imper.) not even consider the idea:

• Except that I want to see your sin-stained countenance, I should not even think of a week in Paris.

not think much of something—(also: think little of something) have a poor opinion with regard to smth.:

• He gives very good dinners, but I don’t think much of his cellar.