I'm no power user, but I've found the GIMP to be satisfactory for 90% of my image editing requirements, and since I've spent most of my adult life as a rather destitute student, it's been an invaluable resource.
Congrats to the GIMP team!
One thing I might have to raise in the GIMP community is what's the deal with sliders on brush-like tools? Very cumbersome to use by default, and I don't know if there's any way to change their behavior. Anyone have thoughts here?