Yes. My boss is one of them. Cal Newport writes quite a bit about doing deep work. [1] Tobias Lutke of Shopify seems to be another. [2]
Most people are similar to how they were when they were in school, because most people don't deliberately put themselves in contexts in which they are forced to grow and develop.
Discipline, in my opinion, is seldom something that you develop entirely for its own sake– rather, it tends to be something that you develop to achieve some greater goal. Along the way you may find that discipline is a worthy pursuit by itself, but few people wake up at 20 and go "Jeez, I want to be really really disciplined!"
It's more like, you have some itch you want to scratch, and you realize the only way to do it is to train yourself.
Most people are similar to how they were when they were in school, because most people don't deliberately put themselves in contexts in which they are forced to grow and develop.
Discipline, in my opinion, is seldom something that you develop entirely for its own sake– rather, it tends to be something that you develop to achieve some greater goal. Along the way you may find that discipline is a worthy pursuit by itself, but few people wake up at 20 and go "Jeez, I want to be really really disciplined!"
It's more like, you have some itch you want to scratch, and you realize the only way to do it is to train yourself.
[1] http://calnewport.com/blog/2012/11/21/knowledge-workers-are-...
[2] http://visakanv.com/marketing/tobi