The way I fly (airport to airport, real aircraft and airline) means that I end up flying a large range of planes, 717s to 777s, A300s to A380s, MD10s, 11s, and 80s, private and commuter jets, small commuter turboprops... all in all, in my just over 1000 hours of organized x-flying, I've flown 42 different aircraft, for 65 airlines, to 133 airports, though its the 42 aircraft which are important here. Most of those aircraft are very easy to switch between, all of XPFW's Boeings have very similar cockpits, as do their Airbuses. The older and/or smaller aircraft get tricky because they come from many different companies, and therefore have many different cockpit layouts. I like to be able to jump in, plug in a flightplan, taxi out and go, but when I fly those aircraft I generally take a couple minutes finding out where all my switches are so I don't have to find them after takeoff. : This ease of use is the main reason I don't use the x737, I simply don't like to bother with the complex systems, even though 1/4 of my flying is done in a 737 variant. And I won't even get started on 3D cockpits, I'll write up something for the rants forum for that. All in all I think I'm very lucky to have the aircraft available that I like to fly, and that the way they have been built trends towards my flying style. That said, I don't see X-Plane continuing in that direction; I see aircraft becoming more and more complex, much like the x737. When the time comes that I'll have to give up my current fleet (which is 75% V8 aircraft), I guess I'll simply have to take the extra time when I jump in a plane I don't fly often enough to "keep current" to review the systems and remind myself of the placements of instruments, knows, switches, etc.