Originally Posted by
Denti
To be honest i don't use 2 all that often, but it is sometimes useful. 10 and 25 on the other hand are normal take off flap settings and therefore used quite often. Much less often during approach though, although it can be sometimes advantageous to do so.
Flaps 2 was used a lot on the -200 in my experience for takeoff. Compared to flaps 1, it gives several thousand extra pounds of capability at some airports depending on the situation. Also, it gives about 5 knots lower v-speeds which always felt kind of fast to me.
For the newer types, I guess, it is just a holdover from the old days.