I know that if I am vs a melee champion I can get them to jump on me while I stand on the edge of my minions, this causes the minions to aggro on them right as I walk out of them getting the melee champion trapped. You can also heavily play around minions during ganks, often I will circle around the minions rather than running straight for my turret because the minions will cluster around them, deal damage, and slow them down.
You can also control you minion waves after the first to slow them down or cause the wave to push either way or freeze. If the enemy is trying to freeze for example I can push one of my caster minions around, stopping them from outputting the same amount of damage and getting to wave to start pushing towards me.
There are a lot of mechanics available due to creep block that one can play around.
I know it is the unpopular opinion but creep block is a really useful tool that I enjoy greatly. Think about whenever the enemy jungler is ganking as your minions are coming into lane. You can walk behind the line of minions and if they try to follow the minions will cluster around them and leave them open to retaliation. If a Lee Sin could just walk through the minion line to Q you then minions wouldn't do much at all and players would lose an expression of skill from the game, because creep manipulation is a skill.