As you said yourself, that was a fluke. I bought a used car 5 years ago for 7K, drove it 75K miles (so far) and spent just 1K in repairs and it still drives fine and could definitely sell for a few thousand dollars. In the end it's costing me under $1000 a year vs a $200 a month lease payment which costs $2,400 a year (with the obvious benefit of a newer car and switching every 2 years).
As I said my case was a fluke, but if you would understand what I went threw, what aggravation it is, when you have a car that should be good, but is just a bundle of issues.
In your case you did very well, not everyone ends up having the same mazel.
With a lease you are paying for the menuchas hanefesh of no worries.
Also - there is the actual depreciation that the car goes down per mile. For a lease, if you end up driving the 12k miles a year, it comes out (if its $200 a month) the about $.25 a mile.
There is no way to project your cost when you buy a car, as you will have to factor in repairs, and resale for when you are done with the car which all this is unknown.
I don't think anyone would argue that when there is a deal with a lease that is an amazing price - like in the past there was the Nissan Sentra for $99 a month - then you are paying around $.13 per mile in depreciation when really the car depreciated more than that, so it comes out you are paying for the car less then the actual cost