Man, I signed up for one of those six-week intensive things last year thinking it'd be some magic bullet. It wasn't, not really, but something shifted. The constant deadlines forced me to produce pages instead of just planning them, which is half my usual battle. More than the lectures, it was getting ripped apart by a dozen other aspiring writers every week that changed my process. You start seeing your own tics and crutches mirrored in their critiques of your work. Suddenly you can't unsee the passive voice or the cliché metaphor you lean on. It's brutal, but you either quit or learn to write through the embarrassment.
Would I say my prose got 'better' in a technical sense? Maybe marginally. The real speed came from killing the preciousness. I stopped treating each paragraph like a sacred object and started viewing drafts as disposable, fixable things. That mindset shift, from artist to craftsperson, happened faster crammed in a virtual room with twenty other stressed people than it ever would have alone. I'm still revising the story I workshopped there, honestly, but the way I approach revision is completely different now.