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The GIMP is powerful, don't get me wrong. You'll get used to it if you give it a try, and coming from somebody who's now been using Ubuntu exclusively for about 4 years, you'll come to adore its flexibility (of Linux in general).
The wonky part for me is that there are three separate windows, where as in Photoshop it's all one window with toolboxes that you can drag around. So if you minimize The GIMP, you have to actually minimize all three windows. This is a hassle. Plus, it's sometimes hard to make the windows stack in the right order.