S! to Grunch for clearing up the thread.
My thoughts:
If you happen to know what SEOW coop is, then you know that the old Il-2 style coop MP GUI is a must.
If you don't know, I really recommend you look it up and get yourself or your squad into one. It's the closest you can get in feeling that you are a part of a really huge battle, where the air combat is just to support the land battle below. (Not meaning to belittle the air war of course
)
The point:
Having 60+ players joining the server, getting squads briefed, selecting the correct planes can easily take
an hour. Even with this GUI, there is lot's of logistics beyond that to get everyone on the server on time, with correct game version etc. If there was no coop GUI, I say the SEOW system just wouldn't be there. The coop GUI allows the organization of large amount of people to start a
time critical mission at the same time.
And as said by others, it is also essential tool in squad training sessions for mentioned reasons.
Links to SEOW for anyone interested:
http://wiki-seow-en.swil.fr/index.php/Main_Page
http://www.seowhq.net/