My writing students get pounded with structure & then I teach them 3 Act structure by breathing in, holding my breath then breathing out.
Structures (3-acts, 5-acts, rising action...) are just paths through the jungle that someone's already cleared by hacking with a machete.
Writing is metabolic. Writers vary in the amount they can take in (reading, living, breathing...) before they need to create.
(I tweet on writing @jcbaggott. This is what I wrote today. Thought I'd share with you writerlies here.)