The "this changes everything" thing has become way, way, overplayed. I saw that and immediately rolled my eyes and stopped reading. It is about at the level of "code ninja" now.
But, and take this as a compliment, Vagrant does change everything. I'm so happy with vagrant now I can really say I have the same OS as my server in my laptop, I can easily switch between them and distribute the env between my peers.
This isn't just a problem of a tech curve or conservatism but one of exposure and marketing. There are a lot of great tools and systems out there that are pretty in your face and obvious to use in certain niches yet.. you'll still run across good folks who are new to them. Always plenty of room to expand! (And that's a good thing ;-))
A bit of constructive criticism:
The "this changes everything" thing has become way, way, overplayed. I saw that and immediately rolled my eyes and stopped reading. It is about at the level of "code ninja" now.