To be honest, I wish I was like you, but I'm not. The financial area of my brain knows it would have been a lot smarter not to spend a couple of hundred thousand dollars or so over the years on new cars, buy used cars for some fraction of the cost and invest the rest, but I used to be an "autoholic", and I while I'm somewhat reformed, not completely. At least I don't smoke, drink, or do drugs.
This is a "Captain Obvious" statement, but the amount lost to depreciation when buying new vehicles depends a lot on the cost of the vehicle. Buying a new $25K car every four years might cost less than a used $50k luxury vehicle every four years. Maintenance for some luxury vehicles is hideously expensive, especially with a higher mileage vehicle.
I've seen some people rationalize buying expensive new vehicles on the basis that the vehicles allegedly hold their value (I'm not saying you did this). When I ran the numbers on it for various vehicles, the expensive new vehicles invariably cost a lot more over time than new economy vehicles, and the expensive new vehicles were a h*ll of a lot more than used economy vehicles.
Having said that, I bought two new vehicles in the past 5 years (one for me and one for my spousal unit). Fortunately, I'm at a point where I can do this without worrying about it too much. As I see it, once you have enough to live on in retirement it becomes a question of what lifestyle you will have now vs the future. It's a balance. That's just me, I will not argue that this is the "right" way to look at it.
I saw an interview with Richard Branson a few years ago. The interviewer asked him what it was like to be super wealthy. He responded "I can only eat one breakfast a day." I realize that's not the whole story, but it is true that a there's not that much additional utility to be gained with most spending above the basics.
Getting even further off topic, my own theory is that most of the "utility" that is gained with expensive clothing, cars, houses, etc. is psychological. It has to do with the "reward" some people get from impressing others, it's not that a $100K vehicle is actually twice as good as a $50K vehicle.