Not exactly. It has more to do with how deeply you process the stimuli, at least in a lot of situations. For instance, I enjoy parties, but then I think off and on for a few days about what happened, like what I learned I could make use of, what I would like to say to each person if I met them again, and so on.

If I have too much novel social stimuli, then I get a backlog and don't want to deal with people until I have time to process it. Extroverts, on the other hand, seem to get all done right in the encounter and are eager to go right on to the next one.