Haven't played the new one once.
you are not even guaranteed the lane/champ you want
HAHAHAHA. wipes away tear First of all, If you haven't played it, you don't know what you are talking about
Secondly, You are Silver V. Which means you have a very good chance to get your main lane and slight chance to get your sub lane. Your champ you want depends on if it is banned or not and I guess if that champ is wanted in another lane that gets picked before yours. From the looks of things you are a Top/Mid player just like myself. Granted I haven't hit Silver V since last season because shit came up this year IRL and not enough time to dedicate to playing.
When I do queue up however I select Mid, then top. 90% of the time... I get mid. No worries (Until my adc picks teemo and support picks crit-alistar... but hey... welcome to bronze!)
The Team builder we knew and 'loved' was shit. You would make a team, fill in the slots of players you wanted and let randoms fill the slots. I am willing to bet money that most of us were in the same situation where we had everything filled and waited 15+ minutes for that support to show up, only to scan the room, then drop. The game was in their hands and it wasn't fair. You could of course start the team as the support and get to the loading screen in about 5 minutes. Again, unfair.
What we have now is you select 2 of 5 roles and queue up to be matched with people who want the other roles. We still have the exact same issue with lack of players wanting to play the support role, you don't see it so clearly. Riot has tweaked the matchmaker so that it seems fair but that took time to do. This of course lead to an increase in wait time as it can't just pull in anyone who put support in their second lane pick like it did to start a match.
Do you want shorter queue times? Demand tweaks to the bot lane to make supports stronger (I think they have this in scope we will see soon which involves an attempt to fix the exp issue down there)