I feel like autofill doesnt help que times.
90% of my que lengths in (silver -gold) is mainly because of people not locking in there picks or bans.
I honeslty feel that if riot would really want to limit que times, having a system where you can select your champ and it locks it in after the timer runs out, or not having to ban a champ, would be ideal in lowering que times.
Sidenote: Ironically whenever I get my main role, someone dodges, when I get autofilled and pick something silly like sivir jungle.. no one dodges... league logic? or is riot just trolling me XD