Kodachrome 200 was extremely good for push processing with a colour balance change, as David says.
We had access to the Kodachrome processing by Kodak Australia. It was usual practice for us to test early am and have film back on a light box around lunch time.
Motor vehicle advertisements using large format in which a fully loaded articulated truck (with a freezer container on the back for instance) could fit into our giant studio, were all done on Kodachrome pushed between 2 & 3 stops.
Food shoots also used Kodachrome quite well with different light temperature sources used in one shot, for a look that was unusual to say the least, but it went over very well with the advertising companies.
The demise of Kodachrome, was also helped along by the rise and rise of the Jobo developing systems being used inhouse, by commercial photographers.
The Jobo ATL machines, really kick started inhouse E6 developing. This was fully supported by Kodak (at least in Australia) by the release of various E6 developing kits in various sizes from 2 1/2 litre through to 10 litre. These were perfect for one shot developing of Kodak's own E6 films.
By 1990 or thereabouts, Kodachrome was on the wane. Not because it was a bad film, but the rise of E6 films and the diverse look that each film had, coupled with inhouse high quality E6 processing done at a far cheaper cost, won the day.
Another nail in the coffin was a Kodak portable E6 processing van. This van which was present at major sporting events, really changed the landscape forever.