You are correct in that the simple action of placing a goldfish on a hook doesn't seem like much of a skill. And niether is tying on a crankbait. You didn't fool those brownies you caught, the crankbait did. I understand where you are comming from. Simply pulling a fish off of a trotline as it is envisioned, doesn't seem like much of a feat. But there is a lot more involved than most think.
I started back into last summer. My son after listen to stories from his grampa, wanted to try it. So we did over Labor Day weekend and scored pretty good. It wasn't a long one like my dad used to do but we had about 15 or 20 hooks. I think we averaged about 7 fish a day all round 5 lbs.
It really was a lot of fun. I think we will do it some more this year. As close as I live to Grand, which is where I cut my trotline teeth, I should set some over there. At least some jugs. I think dads biggest on a jug was 65lbs. I have also seen some 6/0 hooks bent straight.