Question about 을/를 as the direct object particle being used with intransitive verbs

If 을/를 is used with intransitive verbs, it shows the used intransitive verbs have a limited transitivity. I think 을/를 can be interpreted as a preposition in a few cases.

지금 가고 있어요. Now I'm going(there).
내 길을 가고 있어요. I'm going my way.

좀 걷고 있어요. I'm walking.
얼음 위를 걷고 있어요. I'm walking on the ice.

잠시만 좀 지나갈게요. Let me pass.
사람들이 내 옆을 지나가요. People pass by me.