There's a big difference between 'pleasant to be around' and the stereotypical 'Mr Nice Guy' who goes out of his way to do anything and everything he thinks someone might want or need.

Simply bothering to learn someone's name, greet them when you see them, and be interested in what they're doing or saying will make people want to interact with you more.

Tim Cook is both exceedingly pleasant and extremely successful. The world needs more like him.