Not only do they save time in the obvious sense, they also spare stress and frustration that could’ve been regarded as unavoidable. The impending yearly car test, why do you need to remember when that is? The house insurance you need to renew, the phone call you promised to make for a friend, your mobile plan expiring soon, the meeting you just agreed to. You think you don’t spend time thinking about these little, mundane bits, but they are there, accumulating brain-cruft at the back of your head, not letting you achieve a “mind like water.”
I hope it’s clear I’m not blindly advocating paid apps over free ones. Here too, there are unprofitable trades (and please don’t remind me how many text editors I’ve paid for.) I certainly don’t expect anyone to pay for something if they can get it elsewhere for free. But the idea that applications can’t be worth your money just because they’re imperceptible, again: plain irrational.
Or, just ask them this insightful question from David Sparks :
Imagine you’re on your deathbed and you’re told you can live another hour and that it’ll costs you four dollars. What are you gonna say?
I haven’t tried this one yet, but I’m sure not many people would answer with a “no.”