Wii is the best. I have all my VC/WW games on a single SD card page. Every column is a different system (WW, NES, N64, Genesis in that order). Everything else is neatly ordered on the first internal memory page. 99% of the time I turn on the Wii I just quickly point/click and hit start.
The PS3 is fairly good, but not as easy. Yea, I can sort some stuff but I tend to lose things and there are more details always available then I really need. I'd love to be able to remove the Pictures menu and the settings menu shouldn't be part of the main bar. I'd love to be able to remove a lot of the icons I never use.