Is technology making us less mindful? In terms of availability of technology, the modern world is very different from the world in which Buddhism arose, and the Buddhist suttas were written As a result, these days, people do things differently from the past, for example:


performing multiple tasks at once
using medication to try to improve attention
working with headphones on, listening to music or radio
constantly using smartphones and tablets


Are there any consequences of all of this for Buddhist practice? For example, does technology impact meditation and insight? Are we becoming more distracted and therefore adding more suffering to our lives?
When it comes to developing concentration modern technology is definitely a distraction as devices tend to seek your attention. This leads to being scatter brained. This is the reason many meditation centres don't allow you to have them. 

Also modern life style has a lot of responsibilities, and leaves little time for spiritual practice. 

The society as a whole is becoming materialistic and sensualised. This means that you are always in in the process of getting attached to different products and services as well as the more morally loose life style. This hinders development of insight as it is kāma-taṇhā, or "sense-craving".

Mode education and scientific thought has made people to be more inquisitive and skeptical towards traditional or unfamiliar teaching. This is a double edged sword as this can lead to Vichikicha also. 

In a modern world our quality of life has increased due to these technologies. Hence the onus is on the user to use them for ones benefit. E.g. if there is a kitchen knife and you use it to cook you are getting utility. You can use it for a very negative cause like killing or committing suicide. It is the user who is to blame and not the knife.