Take it as a different experience on the GUI side; I know I invest a lot in the motor skill part of the GUI, and this has an effect when I switch platform.

It seems to me that you are not comparing the Moose image with the Pharo image, right? What are you comparing with? Can I look at these changes?

Simply AltBrowser loaded. There isn't much changes overall: AltBrowser is a bit larger than the old system browser and a lot smaller than Nautilus while providing the system browser, the message list and the finder.

It is certainly the proof Pharo provides a good infrastructure for IDE development and experimentation :)