I think maybe this is only a big problem in climates that are on the cold side for tomatoes. The only problem I've had the last few years is tomato blight during one particularly rainy spring, and growing the tomatoes up a trellis and cutting away the excess lower leaves has been sufficient to control it.
Companion planting aromatics may help control pests as well - I usually plant as many of basil, rosemary, parsley, and cilantro as will take in the vicinity of the tomatoes.
In Texas no one I know has ever had their tomatoes survive into August. Blight and the heat kill the plants usually by mid July. You can plant new ones around this time for a fall harvest if you want, but most home gardeners I talk to are pretty burnt out by this time of the season. The heat contributes to that too I'm sure :-)
Probably not as hot as Texas. Rarely goes above 105 F in summer here. Tomatoes seem to do ok at that temperature as long as I irrigate (drip irrigation at ground level specifically - tomato plants don't like getting their leaves wet)
Companion planting aromatics may help control pests as well - I usually plant as many of basil, rosemary, parsley, and cilantro as will take in the vicinity of the tomatoes.