I am personally of the opinion that autofill in its current form is one of the worst things that have happened to this game.
Why should I have to play a role that I don't find fun? It's a game. Games are for fun. I have literally no fun playing support. It's horribly designed. You might have an impact on the game, but it certainly doesn't feel like it. And what do you do in lane? Sit there and do literally nothing for fifteen straight minutes, with the occasional chance to mash a few buttons and watch your ADC do all the damage thrown in. There are some people (like me) who would simply rather wait out the long queue times than be forced to play support.
I understand that there are people who are the other way around. That's fine. At least let me blacklist a role like you promised in the patch notes, rather than have me sit there with that stupid little exclamation mark in constant fear that I will be autofilled into support and have effectively no way to decide my role. I mean let's face it. EVERY TIME I see that, I know what's going to happen. In the unlikely event I don't get autofilled in the game to come, someone will dodge and I'll get autofilled anyway. Happens every time. EVERY TIME.
Riot, please either take this god-forsaken thing out of your game, or make it a little less...dumb.