I personally hate turret mode. I just attack ground and use it as an IS2/Tiger. Works pretty well and can actually kill a Panther 1v1.
Only case I saw turret mode used was way back a year ago. Some dude on Red Ball Express had an unholy amount of support weapons and the KV2 in turret mode behind them and just sniped if you tried to push. Nobody has used the turret mode since that I remember,
Yeah I feel the same. This has at least a little to do with it, might also explain why you saw it year ago:
-Siege mode reload bonus from 0.5 to 0.75.
-152mm non-sieged reload from 10/12 to 9.
-152mm non-sieged bypasses terrain.
-152mm non-sieged angle scatter from 7.5 to 5
That's from December patch of last year, and it came with a bunch of other buffs as well. Those 4 are the ones that only effected 1 mode, and you can see the pattern. Im pretty sure thats a nerf to the siege mode reload if im reading that correctly