Silly introvert...the point of meetings is not to get work done, nor is it to generate ideas. It's to energize the team members, build relationships, and ensure that each person is on the same page and aware of the activities of other members. Most of the actual ideation is done in the shower.

On a serious note, the study cited only shows that groups are more satisfied with their performance on a brainstorming task than individuals are. It makes no mention of groups being more or less productive - except when citing other papers.

The reader should note that our explanation cannot only account for the fact that group members are more satisfied with their performance than individuals, it can also account for the finding that most people believe that group brainstorming is more effective than individual brainstorming, despite consistent evidence to the contrary. We would argue that in groups the impression arises that the ideas of others are very helpful, and recent evidence has indeed shown that ideas of others can be stimulating (Dugosh et al., 2001; Nijstad et al., 2002; Paulus & Yang, 2000). The reduction of failures may therefore be attributed to the stimulating effects of the ideas of others. After experience with group brainstorming, people believe that group brainstorming is effective, because ideas of others triggered new ideas and apparently made idea generation easier. They are, however, unaware of the disrupting effects of other factors, such as production blocking (see Diehl & Stroebe, 1987, 1991).

All this paper tells me is that individuals feel more satisfied after working in groups ... which seems like a terminal positive to me. Even looking at the citations for group work being unproductive, it seems like this issue is a bit more complicated than it is being made out to be. I'm not saying your quoted author is wrong, I'm saying that in order to determine whether or not his statements are founded in evidence, I would have to read the citations of his citations ... and frankly that's bad practice (unless you are citing a review paper).