Yep, it's just a few people stuck in a luddite past where they have to adjust a clock twice a year and whinge bitterly about it.
Whether DST is useful depends on latitude, up here in the cold north the difference between summer and winter is 8 hours of daylight and that's for Southern England, in Scotland it's worse. For somewhere like Spain where there's considerably less difference it's not as much of a problem.
In the UK, with DST the hours of daylight in June are 4 AM to 11 PM (the UK does not have a night in the two weeks of midsummer, it gets dark but still technically twilight) whilst in December it's 8 AM to 4 PM. So if we adopted permanent GMT the sun would rise at 3 AM in summer (when everyone is still asleep) or if we adopted permanent BST (GMT+1) the sun wouldn't rise until 9 AM in winter (meaning you'd be going to and from work in the dark, not just home from work in the dark).
Given the prevalence of SAD (Seasonal Affective Disorder) in the UK, if the working stiffs never got to see any sunlight in the winter months it would be detrimental.
Also, now we're in the 21st century, most clocks can adjust themselves and having to change the one manual clock in my life twice a year means that it rarely drifts more than a few minutes from the ones connected to a time server (one year I was lazy and just left it as I've the minimal intelligence required to subtract one hour to get the actual time and it had drifted over 10 minutes from other clocks by next summer).
If we or the US got rid of daylight savings, I guarantee you that the same people complaining about changing the clocks will be complaining that the sun is up too early or too late by the next summer/winter.