For "normal dives" I do not use dive socks.
For swimming laps in the pool with open heel fins I wear them. Otherwise I get chaffing around lap 60.
For cold cold water dives in a wet suit I sometimes wear them for extra insulation.
Caution: I find that when I wear the socks in my dive boots that the boot can slide off when removing fins if I am not careful. Having the boot come off can be a problem obviously.
For swimming laps in the pool with open heel fins I wear them. Otherwise I get chaffing around lap 60.
For cold cold water dives in a wet suit I sometimes wear them for extra insulation.
Caution: I find that when I wear the socks in my dive boots that the boot can slide off when removing fins if I am not careful. Having the boot come off can be a problem obviously.