^Yes.
I was always under the impression that by "thinning" out the hair they were cutting in layers.
It doesn't have to be a scene mullet but that is sort of an extreme example of the general idea.
Sorry for posting pics of myself but it's kind of the difference between this:

(ignore the colour... what i mean is it's just a straight-across cut)
and this:

which is how it goes when i get layers, with prolly a good 7-8 inches between the longest and shortest layers.
and in both cases my hair was probably blow-dried straight.
It does make it massively easier to deal with, basically b/c there's less hair to style and less bulk hanging off your skull.
Anyway, hope that helps?