Many experienced cooks use ingredients like Philadelphia Cream Cheese and Velveeta.
 

I have been picked on about this;

Confessions of a Velveeta Cheese Connoisseur – The Armchair Sommelier

When my children were young I would make Kraft macaroni and cheese. Was always told it was not as good as when their aunt made it for them. Finally asked their aunt if she did something different and she said she added Velveeta.