You guys gave the excuse of oppressive laning phase for nerfing/reworking Cassiopeia well maybe you need to look at heimer then, and yes Heimer has a stupid win rate across ALL elos.
Not to mention you guys heavily nerf mana usage in the laning phase, yet you leave heimers turrets at 20 mana cost.
Oh no. A champion requires me to play a little differently to win against him. My assassins don't face roll laning phase wtf!?!? So OP. I can't Counterplay a zero mobility squishy Mage with no kill potential.
run cait against him and snipe all the turrets for free gold
Shut up. Heimer's turrets are squishier than minions early game. If you let them live, that's YOUR fault.
Needs to be toned down? I really think that he's pretty weak ATM and his late game isn't so amazing. His turrets can be neutralized/smited/consumed for free.
Heimer was already "toned down" On his re-work release he was broken and pretty much a guaranteed win in team fights
He shouldn't be allowed to have all three turrets up indefinitely. They should burn out like Azirs sand soldiers.
Don't go in on Heimer while his turrets are up. It is what he wants you to do so he can hourglass or R+Q.
Fight his turrets with help from your minions. Prioritize magic resist, a 
will give you good defense against him and give you more mana regen so you can poke his turrets out of commission. Contrary to what you might want to do, play hyper-aggressively from the start so he can't get all 3 turrets up. Letting him get all 3 turrets up early game will let him harvest insane CS and make him almost impossible to fight.
Worth a shot: taking 
midlane is an underestimated strategy vs. heimer. He regenerates a turret every 20 seconds, and you will have smite available every 30 seconds. It will make your life easier, and will also allow you to get a high gold efficiency item and also a nice CC if you take a blue smite. And if he has zoned you to the point that you can no longer CS, you will still be able to grab most of the cannon minions.
A theme that didn't disappear with Heimerdinger's rework was definitely his oppressive laning phase. I can't tell you how aggravating it is for me to play against Heimerdinger. His turrets cost nothing, are almost always up, will trade FOR HIM, and can be used as a fortress. A big issue is if I spend time trying to take the turrets out either A) He'll harass me or B) The turrets will harass me. All of which end in one result: Heimerdinger being unscathed. I don't like how much control he has over the lane because I've seen too many junglers come for a gank and both the mid (or myself) and the jungler get killed because Heimerdinger managed to waddle around his turret home/place his big one.
