I’d like to know what you mean by “special” as that is a relative term.
It does take a particular personality type and level of intellect to be driven to get through the schooling and the residency. Their responsibility is a high as it gets – life and death – not everyone is programmed to handle that kind of stress.
In addition to their clinical work, many in the US used to run their own practices and had to handle a lot of business administration duties and decisions, as well. Nowadays, it is more common for them to have administrative affiliations with health care systems, or they group together to create a corporate entity, which frees them up to focus more on the clinical side of the practice.
Beyond that, like @chyna says, they are human, and have their own issues. For a large percentage, they do have high-esteem for themselves, because they’re smart and have major responsibilities. Some handle it well and are able to remain down-to-earth, while others are arrogant pricks who could use a lesson in humility.