When I first began writing seriously after dabbling on and off for years, sitting and typing out the words was a difficult task, literally. I suffered from some type of brain injury, making it almost impossible to form coherent sentences. I had to force the words from my brain and out through my fingers.
I rewarded myself for my work--fifteen minutes of writing and then fifteen minutes of playing a computer game. Slowly, I finished the book.
And then I discovered NaNoWriMo--National Novel Writing Month where folks attempt to write a 50,000 word novel in a month. I succeeded the first time I attempted it, through computer crashes and health problems. It proved to me that writing quickly is doable and not as difficult as I supposed. At the end of a month, the finished product is seldom polished to perfection but at least something exists that can be formed into a readable book (hopefully).
Technology is at our fingertips. Writers can research in a few seconds what previously took years or months. We also have writing tools readily available. Can't quite find the word you're looking for? Check the online Thesaurus. Having difficulty planning out your book? Well, yes, there are resources available for that also.
One of the problems is too much information. We can get bogged down in the reading of articles purporting to help, and sometimes become paralyzed by the options available.
Once we've learned to navigate the minefield of distractions, most of today's writers are able to produce a book much more quickly than our predecessors, especially when we learn the techniques that work for us (and that learning curve takes some time--ten years for me).
Most of us have also learned how to handle distraction or, at least, to keep them at a minimum. Not all writers are the same. In my case, I must have quiet time for my ideas to percolate and seep and steep. Interruptions are like removing the tea bag from the cup, and then plunging it back into cold water. Yeah ... not much flavor will go into the water now.
In other words, while the writing is hot, I need to keep typing away, getting down as much as possible, without being interrupted. And that's still a work in progress. Life happens, and we must deal with the reality instead of the problems in our virtual worlds.
Here's hoping I get lots accomplished!