Post Haste is an awesome app/utility I use on a regular basis. I have wanted something like this for a long time, especially when working in a busy studio environment with jobs coming in from everywhere and no one person responsible for getting project folders setup. I even entertained looking into getting it produced myself at one point because it was desperately needed at the time. But luckily, Paul Conigliaro came through and did everyone a huge favor with Post Haste. Basically this little utility pops up a dialog where you enter your new project's details and hit 'Create Project'. It creates a copy of your project folder template (which you define), and places it into your chosen directory of choice. Simple? Yes, but use it for a little while an you'll quickly discover how invaluable this little guy is.
I evoke Launchbar, type 'pos'... up pops Post Haste, quickly fill out the fields, hit create and boom, Finder opens to the newly created project folder ready to go. Essentially this really is no different than having your project template folder somewhere, duplicating it, renaming it correctly, & moving it to it's proper location. But it automates and regulates the entire process, and ensures consistency. It will be saving you a lot of time & headaches in the long run, trust me.
The project template you define can include files as well as folders. Which means if you usually start from a templated After Effects set-up file, you can include that in your AE folder as well, and have a fresh copy waiting for you when you start. It is a great way to ensure consistent project naming and folder structure when working. This becomes especially important at the small-t0-medium sized studios. If you're just one guy, sure you'll benefit from the consistency, but you probably know where your files are and have your own system for files. Larger studios typically have this organizational aspect under control, as typically someone or something is responsible for keeping things fairly organized. Aka, there's someone there responsible for yelling at you if your shit's everywhere and you're screwing up the system.
Where things start to go to hell in my experience have been in the smaller studios. The ones where no one is really too responsible for project management like this. Everywhere has a system no matter how broken or awfully disorganized. Things just kind of hobble along for the most part until things start to get misplaced or accidentally become 'unfindable' (aka deleted or otherwise MIA). Post Haste doesn't exactly solve anything in this regard, but that's really getting into something completely different. This is definitely a great thing to adopt if any of this is sounding all too familiar...
There's a great set of preferences to customize and get it setup just the way you need it. The only thing I'd really like to see added is a radio box/selection that would allow me to choose between a couple different project templates that I have. I'm probably in the minority here, but I do a few different types of work in addition to my main After Effects pixel-pushing. iOS apps, the occasional print or web job, etc. It would be nice to have a toggle where I could select which project type it is and have it duplicate the appropriate folder.