I wouldnt say they are useless. Regardless if your boosting or not, your turbo is always spinning, always creating heat, always circulating oil. Even if you arent boositng, letting it idle for ~30 seconds is always a good idea.
With watercooled turbos, you dont have to let it idle for as long, but generally a turbo timer would still be a good idea, unless you have time on your hands. Personally im always rushing, so i invested in a turbo timer.
Ive seen water/oil cooled turbos, been boosted hard, then turned off pretty much right away. Guess what needs a rebuild now? The owner was not aware of the whole, kicking the crap out of your car then turning it off right away is bad for the turbo..
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ride/drive best of both worlds.
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