I do, but I'm thinking semantically - to make the sheet easier to read.
I'm currently using class "cell" for inline-block behavior. So a generic inline block div is
Wouldn't it be easier to read if the element itself called this out.. maybe...
To be honest, this is more usable and pertinent than the section and aside tags they are kicking around.
Because, and let's be clear here, creating a class for a single css behavior is almost no better than using inline css.