I agree that is very important. I think I do better than most by being an observant reader, but it also helps to have things pointed out.
The two things I remembered most when writing was to be concise and not repeat words. You made mention of 'action verbs', and as you said I was likely unaware when I made my edit. I knew the sentence read better, but I didn't know why, which makes it more difficult for me to continue the practice.
So not just reading, but discussing it as well.
I do data science type of work for a geospatial data company, and in my spare time create more data science apps that allow me to sell sports data and analysis as a growing home based business. Then I got caught up in writing, as I can be obsessive/compulsive.