I keep the interior lights in the OFF position in my car to hopefully avoid this problem. When I know my wife is going to drive the car next (this happened just last Saturday evening), I'll switch it to DOOR and actually stand there until I see the lights turn completely off. That way she can see the interior when she gets in.
I cannot bring myself to walk away with the lights still on. I guess it comes from all those cars of old that had lights that turned off immediately, as you mentioned and as they should.
Down with non-simple dome light behaviour!