The differences are pretty minute. It's boils down to a different default install and most likely a different desktop environment. If you're using the same applications -- and as a web dev, that's quite likely -- it's not that much different than modifying your Windows setup a bit (different start menu, theme maybe, small launcher app). Although those tiny differences matter a lot for people, so it's always worth checking it it, maybe in a virtual machine or a second PC. But switching to Mint really wouldn't change your daily work habits, and the system underneath is virtually identical.

As opposed to e.g. CrunchBang (desktop-wise) or Arch (system/packages)...