Abstraction, when used well, is actually a tool that produces more simple code in the long run. It separates different concerns into different pieces of code, makes code readable by extracting common logic and giving it a recognizable name, and reduces boilerplate.

That said, OOP-style inheritance-based abstractions, while useful in some cases, quite often lead people down the complete opposite path - mushing together unrelated logic and then making call sites difficult to understand with a lot of hidden state that has to be kept in mind.