I don't know how many other people wish for something like this, but I'd figure I'd try suggesting it anyway.
I would like an area (and/or new tab) under my profile of my comment history and to search my comment history. I often leave comments on dramas or movies that I watch, and want to know what I said in the past. There are times when I think about a movie or drama and want to remind myself of what I said, in case I want to tell the same thing to someone else when I am making a suggestion. I also may have said something in the comment specifically about the show, but can't remember the drama it was from, or how long ago I posted the comment, so this feature would make it easier to find.
I know YouTube has this feature, and I really like it. I can look at my comment history and search past comments I made, or someone replied to.