PhotoGIMP also remaps all of GIMP's default shortcuts to match Photoshop's keybindings. This means that Ctrl + T for transform, Ctrl + D for deselection, and all the other shortcuts you've burned into ...

I've been using Adobe Photoshop since the old Creative Suite 2 days, and I've been resistant to switching programs because breaking years of habits in order to use a free product never felt worth it.