The Cubase 6 mixer and earlier incarnations looked like a busy mess IMO. I hated them. Such an ugly UI. I stopped using Cubase many years ago when I got sick of how ugly it was. I’ve just moved back in v8, but would have been happy with v7 as I really liked how the mixer has been updated.
I appreciate it annoys you, but don’t assume it’s annoying/slowing down everyone else.