I like the fact that Kodak's recommendation for TMY is to use the same development for EI 400 and EI 800.

So when I am unsure of light levels, I will use 800 when necessary, and 400 when 800 isn't required, and avoid push development.

Unless of course the light is really flat, in which case I will develop longer, but that isn't a push, it is N+1 or N+2