Ofcourse it's going to help you, it's pattern recognition. Maybe you'll completely find a skewer, a pin, a fork or a mate in three or a stalemate on your own. Chances are slim though.
Tactics trainer shows you tactics, that simple, and once you are familiar with them, you look out for them and recognize them while playing.
Besides all that, it's fun and gives a feeling of satisfaction
I'm a bit of a skeptic when people tell me they can improve by solving tactic puzzles. Even though so many people believe it could... i'm just never convinced by it. Did Fischer improved by solving tacics? Did Carlsen? There are no written documentation anywhere that stated they became good from solving puzzles. I know most professionals will say they did a little of both and playing through GM games... but really, what if it's just an innate ability that wasn't honed by solving puzzles?