The "same thing way too many times" is common in most oral epics, it helps the teller to remember, and the audience to follow along. So you get formulaic things in Homer like "darkness covered his eyes" each time someone dies in battle, for example. Gilgamesh and Enkidu walking and walking to the forest to battle with Humbaba also helps drive home just how far away they went, which is to say, to some magical far-off land, another popular trope in plenty of stories.