Intellectuals and philosophers are those guys, that:
1. Think they are better than most of the people because of their intellect.
2. Make up great philosophies explaining everything, especially how all the other "normal" people are thinking, what they want etc.
3. My german teacher used to say, that we are the "intellectual elite" because we know how the world works and read all those great books from Schiller and Ghoete and so on^^
4. Rationality as an answer to everything. That's why intellectuals are so likely to turn into AFC (myself included, thats why I came here). They try to explain love rationaly.
5. The belief in progression. This means that everything new is better than the old stuff. This also means that feminism is better then the old ways, so intellectuals are usually either feminists or they just accept it.
That should be the most important points. Of course being in observer mode all the time and thinking about everything all the time isn't very healthy. My german teacher said: "The thing is that us intellectuals can't stop the flow of thoughts through our mind anymore. I don't know about you guys, because you are still young, but I can't. The ego, as Freud defined it, is just a flow heater. We can't stop that."