I agree that sometimes a new job might bring into light a toolset you;ve never used. I've never taken more than a day or two to get everything up to speed though. Interestingly enough, after being a unix guy for more than 10 years, my latest job required me to use visual studio. My first commit was three days after I started. This days I even have a file with all my VS configuration.

You also gave a perfect example of the only case I explicitly said you shouldn't point the finger to "new developers", which is when IT - or even the senior developers - are at fault for having a crappy development environment.