[JayG]

I don't, for exactly the reason you suggest, although it does make a difference whether you are growing indoors or outdoors.

Tomatoes tolerate quite a wide variety of humidity levels, and there isn't much you can do about it outdoors, but in a GH or PT too low risks flowers failing to open properly and therefore set, too high risks overheating and stressing the plants, and of course the additional possibility of condensation at night which puts them at greater risk of fungal diseases. My GH plants are watered by an automatic irrigation system, and the (slight) excess which drains onto the concrete floor helps stop the air becoming too dry (if yours feels like the hot house at Kew Gardens you may have been overdoing the damping down!)

[Aidy]

I have taken some drastic steps, both applying some shading and also taking out pains of glass to increase the air flow yet it is still mid 30s in the greenhouse tho the plants do look a tad happier now.
Just need to keep an eye on the wind.

[DHM]

Having grown toms in pots and grobags before it's difficult to keep the watering up as they dry out quickly, so they need topping up once, twice, even 3 times a day. Blossom end rot was always an issue. I now have 8 plants in the ground at the moment and I've had to flood them every day due to the hot weather, 1 can between 2 or 3 plants. They're short for cordon types but flowering nicely nonetheless. I just don't think pots or growbags can contain enough soil to soak up and retain the amount of water they need at this time of year. Just my opinion.