I'd rarely push hard unless there was no other way to get the shot. Usually I'd confine it to like 800 if I were shooting Tri-X: if I had to go to a pro lab, that'd be about as much as I'd let someone else do, and it'd get done faster. If I was doing the processing, 1600 was no big deal.
Where I got paid was mostly for like weddings, (Pretty much used the 160 Vericolor for that,) ...the occasional sports gig, but rarely anything where high speed colorwas really worth it given the stuff of the time. Used some Ektachrome 200 somewhere along the way, and I seem to recall playing with the Kodacolor 400s here and there, but they kept changing the stuff, anyway. Usually not for the better, to my mind. Brighter and brighter and brighter till every darn Coke can you didn't even spot at the time seemed to take over the shot. (And there were a lot of them thrown around all the time) Drove me out of using much color at all before long.
I usually kept the color pretty slow, though.
Nowadays I don't think I'd hesitate to shoot some of the faster color films for a lot of things, though.