GIMP does not behave like Adobe Photoshop but we can sure make it look like Photoshop! That will help Adobe Photoshop users switch between GIMP and Photoshop easily and provide for an easier user-interface.
The default GIMP layout is loathed by many given how misplaced the different windows appear. The utility panels will be unified from GIMP 2.8 but until then, we will have separate windows for each panel.
However, this YouTube video shows a cool tweak to make your GIMP appear like Photoshop. Enjoy.