Earlier quoted context omitted.
Gimp is a great example. If you look up screenshots from the late 90s of gimp 1.0 you think "Hey wow, that looks pretty great! I know where the buttons are, I can quickly scan them and it's clear what they do! It isn't a grey on grey tiny soup, they are distinct and clear, this is great. When is this version shipping? It fixes everything!" Apparently almost everyone agrees but somehow we're still going the wrong way,…
You can change the UI skin in the options. I've been using GIMP for years and I don't have any major complaints.
> I've been using GIMP for years
I think usability to users experienced in the software and to new users are two different things. I believe an important part of usability is discoverability which is probably better judged by new users than by experienced users.