I can only offer my opinion based on my experience, mostly SLR/DSLR. I think one of the most revolutionary designs was the one introduced by the Canon T90, which paved the way for the highly successful EOS system. The industrial and ergonomic friendly design, plus the control wheel, have remained basically unchanged since 1986.
The basic SLR design is so good, that even modern MILC are mimicking it (i.e. Olympus, Fuji, Sony), to allure old timers.