The same comparison can be made IRL:
- directly constructing a building with no plan VS
- letting an architect draw up a "blueprint" (= class) and letting the construction workers build it (= instantiation and usage, as many times as needed)
OOP offers more than that. Basically, you bundle together domain data and restrict access (encapsulation), offer it as a blueprint (class) and define its behaviour through methods so one can build (instantiate) as many such "objects".
If you want scalability, you need OOP.
You cannot build a city or a country just by going at it without any planning. You need to map everything out, plan it properly, come up with the blueprints of houses you wanna use, perhaps even reuse some good blueprints from other engineers, ...
And more than that, you can automate the building process to various degrees through abstraction - there are factories that take blueprints and spit out objects. If you wanna create a 3d modell object, you can do so with 3d printers. Thats just a small example. You provide the blueprint (3d data, your "class") and the printer brings it into existence. You can reprint it as many times as you wish. People can take your 3d object (blueprint, class) and extend it (inheritance, polymorphism)... All those extension are of the same type, it is from your original 3d modell. So to some certain extent, they can be treated as that.
Perhaps this is a bit too abstract but imagine another case:
You design the most generic "vehicle".
Then comes along Joe, takes your design / blueprint / class, extends it and calls it "car".
Michelle does something similiar and calls it "bike".
Both are vehicles. Both provide you the general functionality of a "vehicle" because both are, they extend it. So then you can be agnostic about what type of real object you are dealing with, treat them simply as "vehicles" and apply logic to them that works with "vehicles". You dont need to differentiate between Car & Bike because the business logic you are going to apply does not require you to do so!
A vehicle painting factory does not care whether its a Car or a bike. They can paint both...
So many examples!
Edit Sorry for rambling, hope you got the point though!